How to make your own twitter background?

[Nazif]

I'm not really new in twitter. I've always used the normal backgrounds twitter had provided. but i want to make something by my own. and I've tried downloading photos and made them as my backgrounds. I've also tried using several websites for twitter background, but i wonder how all my other friends make their twitter background with THEIR own faces in the background. I'm really clueless right now. and my friends wont tell me how to make them. i need help. all answers and help are really appreciated.