I've been told that pumpkin juice is a favorite drink of wizards and witches. I haven't tried it myself, but I thought it would be fun to design a lapel pin that looks like a pumpkin juice bottle cap. It's the same size as a real cap, with a 3-D wiggly edge, and the back is even recessed a bit.
I custom-lettered the word "Pumpkin" for a peppy mid-century soda pop look. The pin uses orange hard enamel with silver metal. 28mm wide (see last photo for size reference). Black rubber clasp.