If you’re off to Arizona for FUDCon:Tempe in January, or—like me—you just want to help promote the event, why not put put a web banner on your site? The wiki has a banner or two in just about every standard size, so, no matter what your site design, you should be able to find something to fit.

My favourites are the 728×90 leaderboard:

and the 120×240 vertical banner:

which appears in my own sidebar. (The 300×600 half-page banner uses the same design for larger spaces.)

Choose one for yourself from the banners wiki page:
https://fedoraproject.org/wiki/FUDCon:Tempe_2011_web_banners