Creative games
 

Anyone know of a good game that's pretty open ended as to what you can do. If you don't get what I mean I have a few examples. These get boring after a while. And my computer is too crappy to play Garry's Mod.

http://fantasticcontraption.com/
dan-ball.jp/en/javagame/dust/
http://www.garrysmod.com/

Armadillo Run is pretty good - not exactly open ended but a physics game as well and you can create your own puzzles.

Any kind, or a particular one?

As an oldie RPG, Darklands.