Gosh! Things to keep in mind:
-Icons need to be square and at least 100x100 px.
-Banners need to be 800x100 px or a size that scales down to that.
-Mind the spot title, which will cover up whatever's in the right bottom corner of your banner.

I'll leave this open until Friday, October 13th, but if your lips hurt real bad and you need more time to make stuff, just let me know!