So I quite like Schlock Mercenary ...
... and I have been reading this very good comic strip for years. Currently Howard has some monetary difficulties (google adsense pulled the plug on him), and he is inviting banner ads.
So I made one:
Pic: Henriette's herbal blog: banner ad.
Nice, no? I'm sure that TA, Steve or JIM could put together much nicer ads, ones with a sting and a zing to them, though.