HowTo: Pac-Man Pumpkins
Specific instructions aren't included, but David has outlined his process and it's simple enough to emulate:
"Pac Man, ghosts, pellets, and cherries. The Pac Man and ghosts are carved from Sugar Pie pumpkins. The Pac Man was carved on it side so I could retain that round shape. The pellets are just small gourd pumkins turned on their sides. The cherries are made from two crab apples painted red and some 8 guage wire. The pumpkins are mounted on dowels on a board. I used flourescent acrylics to paint the pumkins so they would glow when lit with a black light. Paint was applied with a home-made airbrush made from a paint canister/pen/dust-off canister. For scale, the Pac Man is approx. 10 inches tall."
For more general tips, check out Evil Mad Scientist Laboratories' similar project: