From GameBrew - a wiki dedicated to Video Game Homebrew.
Paint DS is a painting application for the DS. It is available in German and English (depending on the language of your DS).
It was part of the NEO Summer Coding Compo 2009 and ranked 8th under APP section.
Download and extract file.
Copy .nds file and put the pictures folder to the root directory of the card.
You can save your pictures in 20 files with 10 different colors.
You can draw, fill, make rectangels, fill rectangels and draw circles.
Stylus - Draw
R/L - Switch the screens to use buttons on top screen
Y - Help