I think I know what you need. If u want something to bust the sales, to get more from the surfer, I think your toll for that will be flash. The rich movements and amazing special effects are growing too much at the web, for a simple reason: it sells. I will give some exmples of flash banners we did for GFY:
http://www.nastygraphix.net/levon/flash.html
http://www.nastygraphix.net/scott/html/banner2.html
If u can do it even better, you can make a fals cover, something like it [wait for the cover to load]:
http://www.nastygraphix.net/fleshlight/fpa.htm
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So, I think the 2 main points will be a good flash work, and a creative inspiration to do it smarty and make the surfer feels stimulated. We constantly do that kind of works and will appreciate so much to make something for you, feel free to contact me anytime.
good lucky bro