Use the colour wheel as the basis for a single colourfull illuration that could be tessellated across the wrapping paper? color theory chart - beautifully simply way to learn this (plus the fact that I suck at combining colors LOL!
Interactive color wheel art lesson for grade middle school students. Great project for learning about the element of art color! Also for practicing mixing colors and learning the primary, secondary, and tertiary colors.
How To Choose the Right Paint Colors for Your Bedroom