What you do for songs is as follows..
1) Click "my account"
2) Settings
3) Profile settings
From there you can add stuff in HTML format. If you want a playlist to play on your profile to to http://www.playlist.com/ and sign up.. its free. After you add songs to your play list click on "get code" and it will give you a Embed code. Copy that and paste it anywhere in the Profile settings area.
For your background
1) Click "My Account"
2) Settings
3) Design My Profile
From there you can add a background and change around all the colors you want.
For Pics
1) At the top of the page you will see a puprle button that reads "Upload Drawings" PLEASE ONLY USE THIS FOR YOUR OWN PERSONAL ARTWORK! Google images are ment to stay on GOOGLE.
Hope I was able to help. Anything else you need feel free to ask.