I found these Pumpkin Push Ins on the Halloween isle at Wal-Mart.
You get so many pieces in this set. (They also had a monster set)
When my oldest son was a toddler a friend gave us a set of plastic features for our playdough. He is now 16 and we are missing a few pieces, but my littlest (and a few of the bigger ones, which will remain nameless) still love playing with them. Even though these were meant for a pumpkin, they worked perfectly for our homemade playdough.
We are all about costumes around here–we even dress up our playdough!