This is one of the first real drawings I made with the FingerPaint application I'm working on. After some practice, I can draw rather comfortably with it. I'm definitely not able to use my trackpad or mouse this well.
I've recently ditched post-its and switched to spherical clay balls mounted on the end of pencils. This allows the user to use rotation of the wrist which is more precise than movement from the shoulder.
This means that FingerPaint is now more of a pen and tablet without the tablet.