The same way that you upload non-moving backgrounds.
(Save the picture to your computer and upload it in the design settings)
Yes, you can get high quality free twitter backgrounds from:http://www.freetweetgraphics.com
Yes.
Moving backgrounds can be found at a wide variety of online sites. The web domains "MotionWorship" and "VideoBlocks," for example, both contain these backgrounds.
u save them on to ur computer then go on twitter and browse your files and click on that 1 and it comes up
You upload your picture on too twitter
Twitter feeds is where u can put a blog up!
who put together facebook and twitter ang how much is it worth
nope you can change the colors tho
Twitter does not currently support this feature.
Yes, it is free to make a Twitter account.
At the moment, there are no ways that you can add music to your Twitter page.
If you are meaning putting a link to your Twitter profile, by adding a Twitter button, then simply Google "Get a Twitter Button" and you can find various results. Simply copy the HTML code that they give you and put it where you want it on your website.