Time to wrap up the project. You'll have to decide how to power the pumpkin. If you want to have it be fully contained you can use a battery pack. Either make one from 4 AA batteries or use a Mintyboost kit. Basically you'll want about 4.5-6V
Or you can cut a small hole in the back of the pumpkin and use a 9-12V DC adapter.
Finally, use a plastic bowl (preferrably orange, all I had in the kitchen was a blue one!) and put some candy in there! (Like leftover altoids gum)