I agree with Mama Bear, bring your pictures up to 12x12 with one color and then use anoter color for your sashing.Otherwise your sashing will be over powering.Just be careful and not use to much coloring that is in the back-ground of your pictures.Whatever you decide, he will love because it will be special made by his grandma.A small print with cars would work for some of your sashing or as an added border.What boy doesn't like cars.