Wallpaper:

Click on the appropriate image beside your screen resolution – allow the bigger image to load – right click, then “Set as Background”  

Wallpaper 1 - Screen Size: 1024x768
Wallpaper 1 - Screen Size: 1440x900
Wallpaper 1 - Screen Size: 1400x1050
Wallpaper 1 - Screen Size: 1280x1024
Wallpaper 1 - Screen Size: 1920x1200