I am newer to Twitter I will admit.  Just playing around with it and found that I really don't like the background options, and I really didn't like the online background creators either.  Since the background is simply an image, I realized you can simply use Photoshop to create my own custom background.  Here's how:

1. Set an image size of 1200x768 pixels.  This can be a picture or colored background.
2. On the left hand side put your branding and keep it within 70 pixels from the left. 
3. Save it as a JPG file under 800kb and upload to your twitter account.

I used a red background, texturized it, and just added my website name down the side with the text rotated 90 degrees to the left.  Fun stuff to play around with.

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