Anyone who receives this valentine will know that they not only hold a piece of your heart, but they've got the key, too!
Partially blend red and pink clay to create a swirled effect. Roll the mixture out to about 1/8-inch thickness.
Use a heart-shaped cookie cutter (or a small knife; a parent's job) to cut the clay into a heart. Make a small hole about 1/4 inch from the top with the point of a pencil. Follow the package directions for baking the clay, then set it aside.
Glue aluminum foil to both sides of an index card or piece of cardboard. Let dry. Then draw an oversize key on the foil and cut it out. Cover with clear Con-Tact paper, trim the edges, and punch a hole in the top of the key.
Attach both small rings to the big key ring. Thread the key onto one. Connect the clay heart to the other small ring with a loop of floral wire. Write a message (such as "The Key to My Heart") on the key with the marker.