Blue hue background with slight fade. Then it goes into graphical brown brush strokes along both sides. The left side has circle strokes and the right column has a weeds type effect coming from the top right.
Home > Colors and Designs > Brushes
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After you hit the button, when Twitter asks to verify, click 'Allow' and your profile will be changed for you!
You'll also follow @FreeBackground and send out a friendly tweet about TweetXilla & my new business, Freelancify. That's all I ask in return for your free background, but You can always unfollow or delete if you want. =P