Do the road with magnetic paint and add magnets to the cars. Playroom or little boy's room. I think the better idea would be to place this on the floor rather than teaching kids to drive cars on the walls.
RAINBOW STICKS: These look really effective, don't they? You could make and eat these in combination with learning the rainbow song, finding out about different colours (for younger children), or learning about the role of colours in food and health (for