You just need to be careful. Greenguy's general rule is he doesn't like to scroll much on the main page to find the gallery links. So if you put larger ads there you might make him unhappy.
Maybe post an example and what you want to change and he or MrMaryLou can take a look.
Also, if you want to make more sales, a bigger ad won't work as well as adding some good text telling the surfer about the sponsor.
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