I Created a couple drawings just for kicks... on the iPad: http://drawingpadapp.com
I got this app for the kids... I think they'll have fun...
In these quick studies (10 min / day), there seems to be a theme developing... objects flying (or exploding) from some kind of source...
I've discovered that it's pretty hard to draw with only your finger...
And then export the image and did a quick tweek in 'Tilt-shift Lens' app.
fun...