Hmmm, just tried out this app for setting my wallpaper and for some reason it seems to make the wallpaper look much sharper and just better in everyway possible and also takes away any colour banding from certain wallpapers as opposed to just using the stock wallpaper option (gallery 3D) :
http://www.appbrain.com/app/wallpaper-set-and-save/com.android.wallpapersetandsave
http://www.appbrain.com/app/wallpaper-set-and-save/com.android.wallpapersetandsave