I have an idea for TuxPaint on which I would like to work in GSOC 2010.

Kids love doing  "Connect the Dots" game to draw a picture.
Check this URL for a game of "Connect the Dots"

My idea is that we include a tool in TuxPaint that will automatically generate the necessary dots for the picture drawn on the screen or an image opened in tuxpaint. 
User can save the dots image to send it to his friends.
User can connect the dots using the brush to redraw the picture.