Theme by Joe Kidd (aka AverageJoe)
Another Friendship is Magic theme dedicated to all you bronies. This theme is wallpaper-based with five different backgrounds and a few custom icons as well. Also, this is an HD theme, so it may not display as desired on a 4:3 aspect ratio.
The icons where done by me, while credit for the wallpapers themselves goes to SirPayne over at DeviantArt.