Captcha Illustrations

While captchas aren't on my list of favorite things, they are sometimes a necessary evil. In this particular instance, a public blog we're currently working on the design and development for needs open comments and a spam prevention method.

I'm exploring the use of fun illustrations from the site along with an implementation of the s3Capcha jQuery add-on, using some visual feedback to let the user know that they've selected the correct illustration (or an incorrect illustration).

Thoughts?