All you need are some decorative studs & pumpkins! The studs should push in fairly easily, like a thumbtack into a cork board. I found it can cause a bit of pumpkin juice to drip from the puncture, so dab that up with a paper towel & you're good to go!
You can even make an easy-peasy Jack o' Lantern face!
P.S.: Do you prefer faux or real pumpkins? Or both?