Hero and Zombie (free) (i.e. lite) have the "hero" character (complete with a hit points bar) fight a bunch of zombies in either hand to hand or with a gun. Clearly the hero will die, but it's fun watching them fight a bit.
In a way, this is a lot like Doom LWP, where you watch the Doom marine fight the minions of Hell.
Try it. :)
http://www.appbrain.com/app/hero-and-zombie-lite-lwp/com.herozombie.wallpaper