Oh but you can also get non-game programs from Steam! The Black Ink demo is wonderful! It's only a few minutes long, but I think it's amazing.
http://www.bleank.com/BlackInk-a115.html
I don't even know how to use it properly, but it's a fun tool for editing photos.
Hey, thanks for showing me this program. I like trying new art programs on the Surface because most of the existing programs have poor touch UI's or brush support. I wont be able to access my Surface Pro for a couple weeks but if you're interested there is a trial version on their website that you can download for free! http://www.bleank.com/BlackInk-a115.html