I have seen Peelads running on a few sites. I like them as a non-obtrusive way to feature content or ads. I thought there must be some free code to run them. Sure enough, there is – Pageear.
What is even better is there are plugins for CMS software, including this Wordpress Pagepeel Plugin. Very easy to install and configure. Just upload a 100×100 image and a 500×500 image for the initial peel and the full display and set a URL.
Works well. Recommended.