Computer Wallpapers | Avatars | Screensavers
Widescreen images are 1280x800, all others are 1024x768.
Click the preview to display the full picture then right click on the image and select 'Set as wallpaper'
 
Images below are all 100x100 PNG files with transparency effects (so they should match any forum background).
Just right click, select properties and copy the URL of the image then paste it into your avatar URL.
Screensavers are downloaded as a self installing 'exe' file. Click on the link and when prompted, choose 'Save this program to disk'. Once downloaded click on the file to install.