Materials: Small Wooden hearts (or hearts cut out of cardboard), paint (red, white, or pink), sharpie, glitter, magnet (usually you can buy this in a roll at Michaels by kids craft stuff)
Directions: Have your child paint the wooden heart. Allow heart to dry and then decorate as you wish. Use your sharpie to write message on the heart. Attach magnet to the back.
Spinoff idea: You could also make these into conversation hearts and use different pastel paints to paint them. :)