Hey, this is very off topic of the server, but, has looking at your desktop. Just like most ppl, Windows never had that much themes, but some customization tools can help you,
1. Most popular in themes is Windows Blinds. This program never damages you system, and aero support included.
2. The top shell replacement, Litestep. Changes you desktop completely, all themes is a new desktop!
3. For those who can't use these, Uxtheme patcher, or stylerXP, Styler is for XP ONLY!!! Patching Windows files breaks warranty, but it's very simple, but you need the right version of it and a backup of you HDD. I DO NOT RECOMMEND IT FOR ANYONE!!!!
4. Useful tools. Rocketdock, ViStart, ViOrb, mosaic, etc. Useful tools for Your desktop, note that some tools can be viruses
5. Custom login tool, login studio, best one without patching the system, for XP only.
These tools are very useful, most don't harm your system or take much memory, but is better then patching.
Sites:
Windows Blinds: stardock.com
Litestep: litestep.net
Litestep themes can be found on deviantart, I am not responsible of you seeing inaproperate items such as gore, blood, nudity (found on the site, most is block, but warning), killing, or other things some people stare at (lol, at least I'm not that type of person)
Etc, just google the rest, lol
Subject: Window's customizations 
