for the Android tablet (and smartphone).
Paintlet is an easy-to-use yet powerful paint app for Android. 

Lots of brushes and filters,  foreground and background layers, custom rgb and hsb colors, standard and custom image brushes, open and save image files and more.

You can share your Paintlet canvas using Twitter, and search for other Paintlet users with the #Paintlet hashtag.

PaintletScript is an XML language for drawing to the <Paintlet> canvas. Paintlet comes with a standard set of PaintletScripts for framing the canvas, drawing backgrounds and even playing TicTacToe.  You can learn to write your own PaintletScripts and copy them directly to your Android device, or share them with other Paintlet users in the cloud. 

Hello Paintlet