I have several wallpaper apps, but my favorite by far is Wallbase. Get it, you'll forget about the others. No live ones on there though. When I get the Note 2 I will be able to use a live wallpaper cause the battery life rocks.
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For wallpapers I often just search for desktop wallpapers and crop them. A bit more time consuming than grabbing one at the correct resolution in the first place but it really gives you so many options. For apps I have always been quite fond of Zedge.