Make your background picture nicer:

  1. Open irfanview
  2. Choose File / Open to open your picture
  3. To change the size of your picture: Choose Image / Resize and click 640 x 480 (or another)
  4. To lighten your picture: Choose Image / enhance colors and play with brightness and contrast
  5. When you are done: choose file / save and replace the file you had.
  6. Close mozilla composer if it is open.
  7. Reopen mozilla composer and look at your new background (format / page background)
You may also want to look for better background pictures:
www.grsites.com/