I have to say, Paper Toss is very addictive. And so is Mr. Space. I believe Mr. Space is free and Paper Toss is about a pound. If you're looking for LOLS you might wanna try out Talking Carl or Talking Tom
Angry Birds is a great and addictive game, Line Rider is another game where you can be highly imaginative with the simplest ideas, Nano Studio if you want to create music, the Photoshop and Photobucket apps help on fixing up and posting photos, etc.