This pumpkin with a witch hat was made in openscad. The pumpkin is hollow and the hat has a kink in the hat. The pumpkin can be customized and individual parts can be printed!
In the customizer you can choose to print out the components in a printable format. The fully completed model is also able to be chosen in the customizer, but it will not print correctly on most 3D printers. The mouth of the pumpkin is a bridge and results may differ according to printers, but it printed fine for me. To build the complete model I used epoxy. I epoxy'd the two halfs of the hat to make it whole. Also I printed both models in orange and colored over the hat, but you can print the models in different jobs if you want to switch colors also!