I bought a head and a box of pieces from Once Upon A Toy in fall 2012. Fall 2013, I bought an additional 2 heads and the giant plastic head full of custom pieces. Then, for Christmas, I bought the Star Wars set from Costco.
I can now build Darth Tater, the Stormtrooper, R2D2, Pirate Goofy, Donald Duck and all kinds of generic heads with all the Disney accessories.
For the record, I am a 46 year old mother, and I play with my PH's at work all the time. I change the outfit on my desk PH every day. Sometimes, I will allow a customer's child to dress the PH for the day. I make a big deal out of it, and let them know how special it is, as I don't usually let anyone play with my Potato Heads.