If I didn't already love this little machine enough already, I've found this application called 'Brushes' for it where you can paint using your finger directly onto a blank screen or a photo you've taken. The sheer childlike delight in this I can barely convey. It costs £2.99 from the itunes app store.
Here are a few of my first extremely poor efforts. This first one, I call 'Ready Brek Parliament':
'Friday Night Wine':