A word of warning: some of the themes, screensavers etc you can download off the net have a habit of either using up huge amounts of resources or messing with the whole system. I speak from experience. I'm not saying they all will, but you have to be careful. I had this great horror thing going - screensaver, desktop etc but it messed with the Windows OS and I had to do a full-reinstall. :(

I know what you mean. It hasnt happend to me, but I know of people computer totally fucking up on them.. I have taken a lot of computer classes too and it is not recommended you do this .. anywayz I just right click on a pic and save it for wallpaper.. I dont have a desktop theme..