Metal Slug Zombies - lets you blast the zombies if you want and play a mini game where you don't let them reach the other side of the screen. XD Has many options for amount of zombies and planes that bomb them and such. Fun wallpaper
Nexus Revamped Pro...just gorgeous. Simplistic yet cool. Free version is great, pro costs money but gives you tons of customization. Just 4 different colored lines streaking across the screen. Can choose how many lines, how fast, how long tails are, and tons of stuff