Google Nexus S (Android 2.3 Gingerbread) phone was recently announced and yet not available in the market, but few designers and enthusiast, has designed the wallpaper showcased on Nexus S. The wallpaper is available to download and you can try that on your existing Android phone. Nexus S is having a very simple wallpaper with lining in red, green and yellow color.
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Download the wallpaper from this page of Android Central forum. As per this forum, the wallpaper works fine on Evo-4g and Droid Incredible but didn’t work on Droid X. You may try on your phone and see whether it works or not.