Zen Bound is the ultimate relaxation game. Stair Dismount is pretty calming in a way, also. Koi pond is solid.
I'm going to mention a word game called Word Quest Plus. Like it enough to add to my sig. Great game but somewhat expensive but really has all the needs in one game with the tons of content it holds.
Zen Bound helps me relax. Also, Myst (which I still haven't beaten) can either frustrate or relax me, depending on what mood I'm in. EDIT: I forgot about Spawn Illuminati. That app relaxes me as well.
For me it is CoD WaW Zombies, playing this game at night by myself makes all the stress just disappear
If you prefer explosions, techno music, and wall-to-wall action, I suppose a game like Zen Bound could bore you. Personally, I think it's one of the most fascinating and original games in the app store. I absolutely love it. Why are you spamming this thread?
I actually could find it relaxing as well, if I wasn't playing GTA the whole time. It's more of a stress reliever, which is incredibly relaxing. Just think of the little pygmies as the people/things that are stressing you out, and have fun electrocuting/drowning/doing whatever else to them. Again, same thing with GTA. Just going on mass rampages is a huge stress reliever.