Celestialien86 sent me an email about Colors! 3D, the simple drawing program available on iPad, iPod touch, and the Nintendo 3DS. One of the main features is it lets you record your drawing so you can replay how you made it. And since it's a 3DS application, there are LOTS of Nintendo-related drawings drawn in it. Further, there's a site that allows you to upload your creations and see the art of others. In fact, I searched and found a Krystal drawing by Celestialien86 herself.
Colors! 3D costs $6.99 in the Nintendo eShop.