@Graynomad Yes, it runs BASIC, a very limited version from the obfuscated C contests! Arduino Due VGA/BASIC - YouTube
I was coding away on a bit more advanced version, parallel with a simple emulator running on windows but I got on to other things, so that is stalled at the moment. Don't know where to host that code, can send by mail or something if you like!
All inspired by the VGA lib thanks to @stimmer, great work! Just tried the PAL version on a little car DVD panel with medium succes. It shows very nice stable black and white, but lots of color fringe. I suspect my soldering, will try that again soon.
Also, doesn't composite video need a 75 ohm resistor to ground?
edit: Got the color working with an R 2R ladder made of 68 and 150 ohm resistors, looks much better now.