Banner Examples

http://www.bannersnack.com/examples/flash-headers-intros.html#2

http://www.bestdesignservices.com/flash-banners.html

you need to fist choose a product. Then consider colors that are appropriate for your product. Next find your hook, tag line, or slogan. Last, come up with your charge to the viewer, what do you want them to do, buy, see, eat, etc.