Toy Box is like a sandbox entertainment app that you could do what ever you'd like. Just wondering if there's atleast something like this
Line Rider Iride - is an interesting game that might appeal. Its 2.99 and basically has limitless possibilities for play.
Falling Sand - Literally a sandbox game Line Rider iRide - iPhone version of the popular flash game. Just search youtube/google for Line Rider. Fantastic Contraption - Fun physics puzzler, includes a level editor for limitless possibilities. ShapeShape - A different kind of physics puzzle/action game. Has an awesome level editor that allows you to combine levels into a set and play through them all.
This game is very similar to [APP]iPhysics Lite[/APP]. There is also a highly rated actual game [APP]Touch Physics[/APP]