Try the group Toadily Grand Slammin' Profiles, they have lots of useful tips and tutorials.
To add a pic on your background, you need a picture on your hard drive of what you want to show. Go to Personal Details on your home page and then click Personalize my Homepage. Then go to Advanced Profile Customization, and then Change Background Image. At this point you can select a picture from your computer to make your background.
at 1:51 PM on Jul. 17, 2008