It also includes the colored yarn balls promo wallpaper optimized by me with the Gimp in order to have a standard (960x800) resolution without losing quality.
UPDATE: I included 22 new wallpapers from the Nexus S, making a total of 74 wallpapers!
You're probably thinking bentgrass and grass2 are the same wallpaper; actually, the one from the Nexus S (green2) is slided a bit to the left and has more vivid colors. The same is for rainbokeh and street_lights: the second one (from the Nexus S) is slided a bit to the left and has no lights on the upper-left and bottom-right corners.
Here's a preview (click to enlarge) followed by download links. Enjoy!
P.S.: Please, tell me if you think that some wallpapers are missing, so I can add them to the package!