It feels like Twitter just showed up on the internet scene! But found these very cool sites about customizing your Twitter. Haven't we all been tweeting for awhile? Well, me, just a couple of times a week...but it isn't "new". ;0 All I have to say - don't follow me, you will be very bored.
Twitter Backgrounds Specs
Twitter backgrounds on Flickr
Free Custom Twitter Backgrounds to personalize your profile at Just Skins
Stripe generator, very cool app!