I have an old Nintendo DS lite that I don't use anymore and I would like to use its screens with Arduino and try and display colors on them. How would I go about doing that?
You would need to see if there are any (usable) tutorials on re-programming the DS Lite and somehow interfacing its communications port to the Arduino.
I don't really see the "Arduino" point. If you can program the DS Lite itself, its capabilities far exceed any Arduino, so you might as well just do that.