What color should I paint my classroom?

I teach kindergarten and am about to repaint my classroom. I was thinking about a bright color on each wall, but someone suggested that I didn’t want to overstimulate the students. What colors do yall think? Also I have someone willing to paint a mural on one of the walls? What pictures, themes or characters do you think the kindergarteners would like? Boys and girls both.

paint the walls light colors ie. (yellow,pink, baby blue) then each yr lets the kids do their handprints on the wall! I did it when i was little and im in 11th grade and went back to my elm. school to see my handprint!!