Step 1: Download your favorite pattern.

Download and unzip any pattern to your desktop.

Step 2: Login to your twitter account and click “Settings”
The settings link is located in the upper-right toolbar of your home page.

Step 3: Select the design tab and click “Change background image”

The design tab is the the far right tab. Below that to the left, you’ll see a link to “Change background image”

Step 4: Browse to and upload your pattern.
Browse your computer to where you saved and unzipped your pattern and upload. Your pattern will always be a .gif file with the pattern name. I.e. “humidor.gif”

Step 5: Click “tile background” and Save Changes.

Make sure the “tile background” checkbox is selected under your pattern preview and click “Save Changes.” That’s all there is too it. Give twitter a few seconds to refresh and you should start seeing your new background. Enjoy!