Called Growing Aurora, designed by Steel89, a set of 8 nice wallpapers on three different resolution 1920×1200, 1600×1200 and 1280×1024 pixel. You can download this wallpaper pack for free.
Downoad Growing Aurora Wallpaper Pack
If you liked the Steel89 style there is also another wallpapers pack that I can suggest to you. Alter, this pack include simple abstract desktop wallpapers with different styles and colors. Inside you can find a total of 27 wallpapers in 5 different styles.