Yes, you can get high quality free twitter backgrounds from:
http://www.freetweetgraphics.com
Yes.
Joining Twitter is free, using Twitter is free.
Yes, you can get an account on twitter.com.
i know for a fact that you can download apps on iPod touches that have free backgrounds
No. Twitter is free
There are several ways to download free backgrounds. Windows themselves provide a range of free downloads, but but there are also other websites which provide backgrounds for Windows Vista.
Free backgrounds for your PC and be found anywhere on the internet. There are several websites for you to shuffle through and find some great HD backgrounds.
Yes, twitter accounts are free
Yes, it is free to make a Twitter account.
No, you can get the Twitter app on your iPhone for free.
You can find one hundred free themes for blog backgrounds at smashing magazine. They have Wordpress backgrounds in eight sections, ready for you to choose the one best for your blog.
No, Twitter is a free service.