How can I create my own Xbox 360 theme?

Solution 1:

This YouTube video details how to add your own background to the Xbox 360 dashboard.

Essentially:

  1. Create an image of the correct dimensions (JPG format only).
  2. Put the image onto a portable device, or connect your Xbox to your PC.
  3. Navigate to the image you've created via the Xbox .
  4. Select the image and press Y to assign it as your wallpaper.

Hope this benefits someone. Valid as of the Xbox 360 software version being used 14 / Feb / 2012.