Pick a platter for the background. Cut peeled jicama in half. Using the peeler, peel the sides of the jicama until it is pear shaped. The wider end will be the top of the skull. It should be full and rounded. Start narrowing the sides about half way down and round off the bottom. This will be the jaw. The narrow end is the jaw of the skull. Carve a flat spot near the bottom for the mouth. Carve two flat spots near the top for eyes. Place the skull at the top of the platter.
For the spine, arrange cauliflower florets in a row under the skull. Pile red, orange, and yellow pepper slices on either side of the cauliflower for ribs.
Arms and hands
Stack 3 beans on each side for upper arms. Stack 3 more on each side for lower arms. Put a cherry tomato half on each side between the upper and lower stacks for elbows. Add zucchini slices for palms. Make fingers out of carrot slices.
The rest of the body
Arrange 5 broccoli florets at the bottom of the spine for hips. Make upper legs by stacking 3 green beans on each side of the broccoli. Make lower legs by stacking 3 green beans on each side below the upper legs. For knees place half a cherry tomato between the stacks on each side. For feet cut a mushroom slice in half.
Face and hair
Put round slices of olive on jicama for eyes. Add diced olive for the nose and teeth. Arrange arugula under the jicama for spooky hair.