I got a touch screen ultra book from a project I completed at work. There's a free windows app called Fresh Paint that's really fun. It's like finger painting with oils. You can also use pictures as painting guides. If any of you have touch screens and widows 8 give it a try and post your paintings. I'm sure there are other OS apps out there you could use as well.
You'll recognize these next two from Black Diamond:
Black Hill
Vault Rock
Haunted Forest
Sorry about the rotation...Arwen and I were trying to follow along with Bob Ross on this one and ended up liking the half finished painting better than the one he ended up with so the happy little path is a bit haunted.
Zombies