Sometimes your project is in need of details and carving or etching is just the thing to finish it properly. Given that it's the day before Halloween, doing this to a pumpkin seemed apropos! My original plan was to do this on one of reusable craft pumpkins but we got a great deal on a sizeable pumpkin at Aldi so I'll be elbow deep in it's guts tonight!
Below you'll also find a few videos and instructables on carving other common prop mediums.