I suggest a powdertoy application for both iPhone and iPod touch. I think it would be a great idea as it is a great game but is frustrating because you can only play on laptop or computer.

I would suggest there to be a black work space with a toolbar at the bottom. This could have an element button to bring up the menu for the elements, a new document button and a sign in button. I think this would make it possible to get the most out of the space there is. I would also suggest for there to not be a open simulations button, as this would make the application to complex.