Hrm... I've got a couple :p
Alice: Madness Returns is a really pretty game. Everything flows nicely together and kladfj it's so beautiful *w* the different worlds that you can go fight in are really nice and well done.
The some of the scenery in Halo 4 was just... wow, it blew my mind, it was really pretty.
The Borderlands series is pretty and I love the style of that game :3
I'm sure that there are more that I could list off, but I'm too damned lazy to get up and look at my extensive game collection XD;