There is a total of 12 wallpapers. Each one comes in 1024x768,1600x1200 and 1900x1200 there are 4 different ones.
Here is Captain_H's first wallpaper for CnC 3. It features the Command and Conquer 3 logo with a globe and a map in the background. It comes in 800x600 and 1024x768 resolutions.
Wallpaperpack compressed as *.zip-File with the final Sickle and Bullfrog unit concept arts featured in the Tacitus Thursday news