First, I found this easy pumpkin piece from DIY Network. I made mine a mini-version though, with gourds.
Next, I found pattern from Reliquary Arts for a skull. But rather than making just the full skull, I combined this idea with a mug cozy pattern. I first made a general mug cozy, the following the instructions for the eye sockets and eyeballs (had to make a little smaller though to fit the cozy).