Turtle Squared Breaking Down the Coloring Barrier

Remember these fun childhood grid transfer activities?  This book had a turtle, I transfered him then took him to the next level with color.  Instead of standard coloring why not treat each square as its own unique piece?  Each square in a diagonal fashion has a choice of three colors.  The background, first character color and second character color.  This would be great with all cool or all warm.  In this instance I went bold with neutrals and red tones.