Working the neck is always good insurance (accidents, whiplash, etc) to keep the area strong and protective of the neck tissue, ligaments and neck bone(s) themselves. The neck can be a very strong area of the body. Shrugs, cleans & Hi-pulls target the upper and lower traps, but can have a growth effect on the neck. With some guy's, not so much. That's where individual exercises come in.
Probably the best all around neck exercise is the Wrestler"s Bridge, front and back. Can used a BB held overhead, after time, when doing the back version. Head straps are also a good investment for neck work. Lot's of weight can be handle on this exercise. Can also hook up a head strap to a cable device/pulley. Again the neck region has a potential of being very powerful. The neck will usually grow fairly well with direct attention.
Head lock drills, which wrestler's train on, is excellent, though the ears will need a guard. As Bluto suggest, a towel, folded and wrapped around the head, is excellent. Though better results will come from having a Bud add the resistance rather than yourself. Good Luck.