I've never been one of those "PUMPKIN SPICE IS LIFE" people, but I think this would be fun to try. He just uses a few simple ingredients like pumpkin puree, some sweetener and some heavy cream and then mixes it until its fluffy foam.
Next he puts the ice and some pre-brewed cold coffee in his cup, puts the pumpkin foam on top and mixes together. So simple and delicious. It looks like you could get about 6-8 sets of 'foam' out of one can of pumpkin puree which cost between $2.50-$4 depending on where you shop. Try it out and let me know what you think!