This is the craft that I did for my oldest Son, Parker's third grade classroom. The older the kids get, the harder it is to come up with something that both the boys and the girls will like to do and not think it's to babyish to do! This was a super simple thing to make.
Mason pint jars (or any size you would like)
lunch sized paper sacks
Crystal clear spray paint
Due to time contrainst I painted the orange on the jars and put a coat of clear spray over them before taking them to the school. The kids enjoyed painting their Jack-o-lantern faces on them and making the stems! To do the stems simply open up the lunch sack and place the sealing lid from the jar shiny side up in the bottom of the bag, then slide the metal ring from the jar over the top of the bag and
manipulate until you can get the bag covered lid to fit snugly into place. You may have to mess around with this a bit to get it to fit properly so you are able to screw the ring back onto the top of the jar.
Here are the ones my boys made with Mommy's help!