Most effective way to customize Twitter account is by using customized background image. We have seen number of online tools like twitbacks and Twitter designer to create cool Twitter background images and even resources that allow download of Twitter background images in original PSD
Download Twitter backgrounds with original PSD file
We have seen number of Twitter resources that allows you to download cool looking Twitter background images. However, most of them offer non-editable JPEG or PNG background images that leave very little scope for customization. TweetStyle fills in for that and offer Photoshop PSD file
10 Twitter directory for friends, apps & inspiration
Twitter userbase is huge and growing rapidly day by day. There are numerous Twitter based apps and resources for enhanced Twitter experience (already listed 40+ of these). If you are a Twitter newbie or intermediate user looking for best Twitter plugs in terms of new Twitter friends, apps,
Design & create customized Twitter backgrounds
Besides the Tweets / messages, a unique background on your Twitter account can make your Twitter profile standout. There are number ways to design and customize Twitter background for that unique look like using latest Flickr photos as Twitter background, use Twitbacks, download free