diff --git a/README.md b/README.md
index dc76026..391ad32 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,25 @@ Any extra attributes will be passed straight to the template as variables.
 {% responsive_image path: assets/image.jpg alt: "Lorem ipsum..." title: "Lorem ipsum..." %}
 ```
 
+### Liquid variables as attributes
+
+You can use Liquid variables as attributes with the `responsive_image_block` tag. This tag works in exactly the same way as the `responsive_image` tag, but is implemented as a block tag to allow for more complex logic.
+
+> **Important!** The attributes in the `responsive_image_block` tag are parsed as YAML, so whitespace and indentation are important!
+
+```
+{% assign path = 'assets/test.png' %}
+{% assign alt = 'Lorem ipsum...' %}
+
+{% responsive_image_block %}
+    path: {{ path }}
+    alt: {{ alt }}
+    {% if title %}
+    title: {{ title }}
+    {% endif %}
+{% endresponsive_image_block %}
+```
+
 ### Template
 
 You will need to create a template in order to use the `responsive_image` tag. Below are some sample templates to get you started.
diff --git a/features/responsive-image-block.feature b/features/responsive-image-block.feature
new file mode 100644
index 0000000..f8ea4e8
--- /dev/null
+++ b/features/responsive-image-block.feature
@@ -0,0 +1,46 @@
+Feature: Jekyll responsive_image_block tag
+  As a Jekyll template developer
+  I want to include Liquid variables when rendering my responsive images
+  In order to dynamically generate my responsive images
+
+  Scenario: Simple image tag
+    Given I have a responsive_image configuration with:
+      """
+        template: _includes/responsive-image.html
+      """
+    And I have a file "index.html" with:
+      """
+      {% assign path = 'assets/test.png' %}
+      {% assign alt = 'Lorem ipsum' %}
+
+      {% responsive_image_block %}
+          path: {{ path }}
+          title: Magic rainbow adventure!
+          alt: {{ alt }}
+      {% endresponsive_image_block %}
+      """
+    When I run Jekyll
+    Then I should see "<img alt=\"Lorem ipsum\" src=\"/assets/test.png\" title=\"Magic rainbow adventure!\"" in "_site/index.html"
+
+  Scenario: More complex logic in the block tag
+    Given I have a responsive_image configuration with:
+      """
+        template: _includes/responsive-image.html
+      """
+    And I have a file "index.html" with:
+      """
+      {% assign path = 'assets/test.png' %}
+      {% assign alt = 'Lorem ipsum' %}
+
+      {% responsive_image_block %}
+          path: {{ path }}
+
+          {% if another_alt %}
+          alt: {{ another_alt }}
+          {% else %}
+          alt: {{ alt }}
+          {% endif %}
+      {% endresponsive_image_block %}
+      """
+    When I run Jekyll
+    Then I should see "<img alt=\"Lorem ipsum\" src=\"/assets/test.png\"" in "_site/index.html"
diff --git a/features/responsive-image.feature b/features/responsive-image.feature
index 646bad0..73ff7e0 100644
--- a/features/responsive-image.feature
+++ b/features/responsive-image.feature
@@ -1,4 +1,4 @@
-Feature: Jekyll responsive-image tag
+Feature: Jekyll responsive_image tag
   As a Jekyll template developer
   I want to include responsive images in my page
   In order to best cater for devices of all sizes
diff --git a/lib/jekyll/responsive_image.rb b/lib/jekyll/responsive_image.rb
index 0feb605..5b6d3ec 100644
--- a/lib/jekyll/responsive_image.rb
+++ b/lib/jekyll/responsive_image.rb
@@ -1,4 +1,5 @@
 require 'fileutils'
+require 'yaml'
 
 require 'jekyll'
 require 'rmagick'
@@ -6,6 +7,9 @@ require 'rmagick'
 require 'jekyll/responsive_image/version'
 require 'jekyll/responsive_image/defaults'
 require 'jekyll/responsive_image/utils'
+require 'jekyll/responsive_image/resize_handler'
 require 'jekyll/responsive_image/tag'
+require 'jekyll/responsive_image/block'
 
 Liquid::Template.register_tag('responsive_image', Jekyll::ResponsiveImage::Tag)
+Liquid::Template.register_tag('responsive_image_block', Jekyll::ResponsiveImage::Block)
diff --git a/lib/jekyll/responsive_image/block.rb b/lib/jekyll/responsive_image/block.rb
new file mode 100644
index 0000000..dabae5b
--- /dev/null
+++ b/lib/jekyll/responsive_image/block.rb
@@ -0,0 +1,23 @@
+module Jekyll
+  class ResponsiveImage
+    class Block < Liquid::Block
+      def render(context)
+        config = ResponsiveImage.defaults.dup
+        config.merge!(context.registers[:site].config['responsive_image'])
+
+        attributes = YAML.load(super)
+        image_template = attributes['template'] || config['template']
+
+        resize_handler = ResizeHandler.new
+        img = Magick::Image::read(attributes['path']).first
+        attributes['original'] = Utils.image_hash(attributes['path'], img.columns, img.rows)
+        attributes['resized'] = resize_handler.resize_image(img, config)
+
+        partial = File.read(image_template)
+        template = Liquid::Template.parse(partial)
+
+        template.render!(attributes)
+      end
+    end
+  end
+end
diff --git a/lib/jekyll/responsive_image/resize_handler.rb b/lib/jekyll/responsive_image/resize_handler.rb
new file mode 100644
index 0000000..1d8e841
--- /dev/null
+++ b/lib/jekyll/responsive_image/resize_handler.rb
@@ -0,0 +1,52 @@
+module Jekyll
+  class ResponsiveImage
+    class ResizeHandler
+      def resize_image(img, config)
+        resized = []
+
+        config['sizes'].each do |size|
+          width = size['width']
+          ratio = width.to_f / img.columns.to_f
+          height = (img.rows.to_f * ratio).round
+
+          next unless needs_resizing?(img, width)
+
+          filepath = format_output_path(config['output_path_format'], img.filename, width, height)
+          resized.push(Utils.image_hash(filepath, width, height))
+
+          # Don't resize images more than once
+          next if File.exists?(filepath)
+
+          ensure_output_dir_exists!(File.dirname(filepath))
+
+          Jekyll.logger.info "Generating #{filepath}"
+
+          i = img.scale(ratio)
+          i.write(filepath) do |f|
+            f.quality = size['quality'] || config['default_quality']
+          end
+
+          i.destroy!
+        end
+
+        resized
+      end
+
+      def format_output_path(format, path, width, height)
+        params = Utils.symbolize_keys(Utils.image_hash(path, width, height))
+        format % params
+      end
+
+      def needs_resizing?(img, width)
+        img.columns > width
+      end
+
+      def ensure_output_dir_exists!(dir)
+        unless Dir.exists?(dir)
+          Jekyll.logger.info "Creating output directory #{dir}"
+          FileUtils.mkdir_p(dir)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/jekyll/responsive_image/tag.rb b/lib/jekyll/responsive_image/tag.rb
index 70432e6..43856cf 100644
--- a/lib/jekyll/responsive_image/tag.rb
+++ b/lib/jekyll/responsive_image/tag.rb
@@ -12,72 +12,14 @@ module Jekyll
         end
       end
 
-      def resize_image(img, config)
-        resized = []
-
-        config['sizes'].each do |size|
-          width = size['width']
-          ratio = width.to_f / img.columns.to_f
-          height = (img.rows.to_f * ratio).round
-
-          next unless needs_resizing?(img, width)
-
-          filepath = format_output_path(config['output_path_format'], img.filename, width, height)
-          resized.push(image_hash(filepath, width, height))
-
-          # Don't resize images more than once
-          next if File.exists?(filepath)
-
-          ensure_output_dir_exists!(File.dirname(filepath))
-
-          Jekyll.logger.info "Generating #{filepath}"
-
-          i = img.scale(ratio)
-          i.write(filepath) do |f|
-            f.quality = size['quality'] || config['default_quality']
-          end
-
-          i.destroy!
-        end
-
-        resized
-      end
-
-      def format_output_path(format, path, width, height)
-        params = Utils.symbolize_keys(image_hash(path, width, height))
-        format % params
-      end
-
-      def needs_resizing?(img, width)
-        img.columns > width
-      end
-
-      def ensure_output_dir_exists!(dir)
-        unless Dir.exists?(dir)
-          Jekyll.logger.info "Creating output directory #{dir}"
-          FileUtils.mkdir_p(dir)
-        end
-      end
-
-      # Build a hash containing image information
-      def image_hash(path, width, height)
-        {
-          'path'      => path,
-          'basename'  => File.basename(path),
-          'filename'  => File.basename(path, '.*'),
-          'extension' => File.extname(path).delete('.'),
-          'width'     => width,
-          'height'    => height,
-        }
-      end
-
       def render(context)
         config = ResponsiveImage.defaults.dup
         config.merge!(context.registers[:site].config['responsive_image'])
 
+        resize_handler = ResizeHandler.new
         img = Magick::Image::read(@attributes['path']).first
-        @attributes['original'] = image_hash(@attributes['path'], img.columns, img.rows)
-        @attributes['resized'] = resize_image(img, config)
+        @attributes['original'] = Utils.image_hash(@attributes['path'], img.columns, img.rows)
+        @attributes['resized'] = resize_handler.resize_image(img, config)
 
         image_template = @attributes['template'] || config['template']
 
diff --git a/lib/jekyll/responsive_image/utils.rb b/lib/jekyll/responsive_image/utils.rb
index f13d7e7..a8505c9 100644
--- a/lib/jekyll/responsive_image/utils.rb
+++ b/lib/jekyll/responsive_image/utils.rb
@@ -8,6 +8,18 @@ module Jekyll
         end
         result
       end
+
+      # Build a hash containing image information
+      def self.image_hash(path, width, height)
+        {
+          'path'      => path,
+          'basename'  => File.basename(path),
+          'filename'  => File.basename(path, '.*'),
+          'extension' => File.extname(path).delete('.'),
+          'width'     => width,
+          'height'    => height,
+        }
+      end
     end
   end
 end