30 Beautiful Vista themes for XP
Installation:
1)Extract the UXTheme Multi-Patcher 4.0.exe on your Desktop
2)Extract all themes in C:\WINDOWS\Resources\Themes (If you do not have such folder plz create one)
3)Apply Patch (UXTheme Multi-Patcher 4.0.exe) Ignore any Windows File Protection message!!!
4)Restart Windows
5)Right-Click on Desktop>>Click Properties>>Select 'Appearance' Tab>>Choose your theme in the 'Windows and Buttons' Drop-Down menu.
Enjoy!!!!

P.S: If it doesn't work for you even after doing all this please don't worry. There is more help at hand. Please care to read all the comments below. A few nice men/women have posted their own methods how they got these themes into action.