Here is an archive of windows themes and utilities for Windows XP-8.1 .

Please download uxtheme patcher for your version of windows before installing any theme

(I did not create these themes but i tested them and they work)

UXtheme patcher windows XP,Vista,and Windows 7 

Uxtheme patcherFor Windows 8 core,pro,and server 

Windows XP themes

Windows 7 style for vista.rar 

Windows_vista_black_theme 

 Windows 7 themes (non-aero themes)

 Windows 7 basic black

windows 7 blue basic 

Windows 8 themes

Windows 8 Release Preview theme for windows 8 RTM

Windows Basic Theme for windows 8 RTM

 Extras! Aero for users that can't get aero

 I understand older hardware can't experience aero theme on your computer, in my case it was the Intel 845G. windows areo required a graphics card with 128mb. Here is something that should give you the aero experience. (Before using this application please download universal theme patcher  for windows xp,vista,and 7 and make sure you have dot net framework 3.5 installed.

 you can change the color of the windows boarders and make how transparent or blurry or both!!!! works for XP Vista and 7(Not tested with windows 8)  click here to download it (Boarder Skin 0.3)