First of all, you need to patch your UXtheme.dll if you haven't already. You can find that here, instructions are included.
When you download the theme, extract the files into C:\Windows\Resources\Themes. Right click on the desktop and go to Personalise, click on Window Colour and Appearance, then click Open classic appearance properties for more colour options. You will see that Windows Aero and Windows Vista Basic have been duplicated. Don't worry, they are the new themes. Click on them and you can change the theme as you wish.
Always read the ReadMe files.
Themes:
- VistaRemix new.gif ( 120bytes ) Number of downloads: 8
- Aero 4074 Blue Sky new.gif ( 120bytes ) Number of downloads: 8
- Tiberium new.gif ( 120bytes ) Number of downloads: 8
- Aero MaX Dark Live
- Maxximum Aero Live
- HilledSE
- AeroClear Glass
- LunaVista
- RedEye Vista
- BlueEye Vista
- Longhorn Beta 1 Style
- Visinti
- Aurora Full Glass
- Vectrum
- Aero 4074 Remix
- AeroClear Greaphit
- Metals Set new.gif ( 120bytes ) Number of downloads: 8
- Antique Red new.gif ( 120bytes ) Number of downloads: 8
- Pastel new.gif ( 120bytes ) Number of downloads: 8
- Four Colored Shells new.gif ( 120bytes ) Number of downloads: 8
- Ultimate Vista
- WMP11
- Energy Vista
- ShadowStyle
- Longhorn
- RedandBlue Aurora
Enjoy