If you are running Android 2.1 (or higher) on your phone and want to add some bling to it, you can always use a Live Wallpaper.
And if you happen to be an old school Mario fan, the wallpaper of wallpapers have now been released! Check out the vid below from AndroidCentral showing it in action:
The wallpaper is free and available on the Android Market, check the developers thread at xda-developers for more info and other ways to download it.
Beware though, this Live Wallpaper is not going to prolong your battery power exactly…
Mario Live Wallpaper for Android 2.1