Twitter – How to change the background on Twitter

There's nothing built into Twitter itself.

There's a service call Bettween that offers this. It's a little slow the first time you use it, but claims it's quicker for subsequent visits.

Additionally this post on Gamblz from 2008 lists 5 ways to find and track conversations using 3rd party applications. I don't know whether any of these are still working.

You can follow the instructions on this page:

1. Open your Twitter Profile and click Settings
2. Click on the Design tab
3. Either select a existing theme or click Change Background Image to use your own image