Here are two Hitachiin Brothers wallpapers:

Color: 1600×1200
Color: 1920×1200
B/W: 1600×1200

The foreground is two images from the manga that I scanned, threshholded and then added color and effects.   I made the background pattern in Illustrator.   The flowers and the butterflies are purchased from iStockPhoto.  I rasterized them and added color and some effects.  I like this wallpaper a lot because purple is my favorite color.