AutoKeen won't do that. Many have asked.
History Lesson: (ignore if you want to)
Essentially, AutoKeen was born from the "lite" version of AutoKeen that the true KeenSpot artists have at their disposal, which will do multiple-directory builds. Example: El Goonish Shive by Dan Shive -- four calendar-based parts to his site.
Why do they get all the fun? 1. It's a lot more work to set up. I saw the instructions once. We get it easy. 2. It's a lot more work for the admins, which is why Keen has had a paid tech since they started. Our admins have enough crap to deal with. 3. They're the 'Spot. We're not. Just another "benefit" of being invited into the club.
I'm sure there is free software out there that can generate thumbnails and code for you on your own comp, which you can dump into a template (with the necessary ad/footer code) and then upload manually (/workspace/webpages/art or stuff or whatever). "Google is thy friend." And then there are those other online services. Good luck, and have fun.