From Thinkgeek:

Each set of Critical Hit Cookie Cutters comes with six of the most random cookie cutters you’ll ever meet. You get a d4, d6, d8, d10, d12, and d20. Want two d10s for your percentile dice? Not a problem. Bake two. The Critical Hit Cookie Cutters are a great treat for you, and a critical hit at every party, whether it’s a party of the celebration sort or the adventuring sort. Or both.

[Critical Hit Cookie Cutters (d4, d6, d8, d10, d12, d20)]