Basically anything from ice cream green - Tiffany blue and anything in between but Aqua/turquoise is a safe bet for a color. Any shade bright or light.there will be something similar and blend able for either gender.
Love this for our laundry room wall! From pin: I used rough sawn cedar that was left over from a friend's warehouse . I cut out the pieces and created the puzzle on the ground then picked random ones to stain and paint.