Yer that's what my son's like too. I was a little bit horrified when he painted a gnome with red eyes. then he was playing with some unlit globes from christmas lights and he couldn't tell the diff between red and green.
wOW - never considered that. My son is colour blind and we've taken him to a few 3d movies and it never occured to me. It's kinda weird though when he is trying to describe someone and says they have green hair.