What to do with leftover pumpkin seeds? String them into a pretty necklace.
Scoop out a pumpkin and place the seeds and pulp in a bowl of water. The seeds will quickly separate from the fibers and float to the top. Remove seeds and rinse them, then place them, in a single layer, on a paper towel or cookie sheet. Let dry at room temperature 6 to 8 hours. Do not let seeds dry too long before stringing them, as they will become brittle and hard to work with. Thread a sewing needle with silk beading cord, and pierce seeds, stringing them in the patterns shown at top (tie knots in between for spaces) or your own. Knot cord

This would have been a fun thing to do with the pumpkin seeds but the day AFTER Halloween they are either in the garbage can or roasted to eat. Should have shown us the idea a couple of days ago.