Look for oven-bake polymer clay ($3, Michaels) and get as many colors as you like. You should be able to make several pairs out of one block of clay.

Making DIY clay magnets is easier than you think. Kids and adults alike will love making this easy polymer clay craft idea for their fridge! Oven bake clay is so easy to work with that even young ...

5. Bake the Clay – Place pieces on a parchment-lined baking sheet and bake according to the clay's instructions (usually 15-30 minutes per ¼ inch at 275°F).