Take 4 canvases of each size), paint them a solid base color and add vinyl or stenciled design. stick decals onto canvases, paint the whole thing and then remove the stickers to reveal the wonderful artwork!
This would be a neat Valentine's Day gift. if I could bring myself to punch holes in a book. Maybe I could use old magazines instead. Punch a hole in the shape of a heart into an old book and arrange them into a frame for a decoration.