NPR's All Tech Considered blog takes a look at Noel Dickover, a hobbyist pumpkin carving master, who's created some amazingly detailed Star Wars themed jack-o-lanterns. "For Halloween and Star Wars geeks alike, it's truly a harmonic convergence of awesomeness."
As Noel says, "There's a difference between carving a pattern on a pumpkin, and a pumpkin sculpt. In the case of R2-D2, or the Deathstar, for instance, the pumpkin "is" the object, not just a portrait. So in thinking about carving R2-D2, I absolutely had to have a fairly tall, completely cylindrical looking pumpkin. I found one that weighed in at right around 40 lbs. Without this, there's no way I could have gotten the detail I was looking for."