In class Sam showed us how to make a coin tossing app called SillyFlipper. I have expanded upon it and submitted it to the app store. If you want to see how you can use functions in TouchDevelop to brows my code at:

https://www.touchdevelop.com/xgmj

view it in action:

https://www.touchdevelop.com/users/CodeSquire/CoinFlipper/

Touch Develop takes a bit of getting use to but it can crank out some simple apps pretty quickly. If you get frustrated at it at first, just give it a little time and it does get much smoother as you learn it. The intellisense is quite good at completing your code for you.