Fravrit.com is a website based on the content management system Drupal. 
Here is a screenshot of the Fivestar voting module. The image used (the star) can be easily configured to be any image you want. The number of ratings can also be configured to be 1-10.
If you'll notice the screenshot above, the item "Cold Stone - The Pie Who Loved Me" was tagged with Cold Stone, dessert, and ice cream. Free tagging is a feature of CMS's and can be placed on any item including images. Once the tagging is in place, the system can create a "tag cloud" (as shown in the screenshot below). The more content there is for a particular tag, the larger that tag will become in the cloud.
