My desk needs some help

I just moved to a new cubicle...for the third time within a month, but it seems as though this is where I'll be staying for awhile.

The true travesty of the situation is, if you came to my desk at work, you would have absolutely no idea how geeky I am unless you can see my desktop image:

In the next couple of weeks, I am going to remedy the situation. I just wish I knew where to start...