I also use a Windows machine but the desktop on that is locked to show a set university image, links and stuff, so I left that one alone.
As you can see, it is pretty messy, as I tend to put stuff there as I work and then have a tidy up when I run out of space.
The photo is of Custard, the day we got him, so here it is without all the junk on top:
If you want to do one of these and are not sure how to do it, all of the instructions are on Terri's blog - see above for the link. No point replicating it all here...