Here's how to change the theme on your CafeMom page:
Click the 'My CafeMom' tab.
Click the 'Colors + Styles' button underneath your profile picture.
You can choose a theme from many different categories. The categories are listed on the left side of the page.
I did it myself, you have to go to the Advanced Editor and do it from there, make sure that you have whatever pic you want as your background, or however you want it. Hoped I helped, you can check out my page if you want