We had some fun with this!
I dyed some "cellentani" noodles using rubbing alcohol and green food coloring (no real recipe there, just dump some rubbing alcohol in a bowl, make it a nice green shade and then let your noodles soak for five minutes or so). They have a nice twisty shape, perfect for pumpkins stems! We then made some play-dough, making it smell good with orange and almond extracts as well as some cinnamon.
The boys enjoyed themselves immensely. Play-dough is always magic around here. ;o)
(And yes, I must once again credit Pinterest for giving me the idea . . . there's nothing original around these parts, just a whole lot of copying . . .) ;o)