Seeing what people have on their desktop can teach you a whole lot about a person. Post yours so we can see what you're like! Mine is attached below.
All you have to do is hit the "Print Screen" button (abbreviated as "prt sc" on some computers... you may have to hit the "fn" or function button if you have a laptop) and open your favourite photo editing software. It is also easy to use Paintbrush. Hit Ctrl+V and paste the image into the file.