Gaping wounds positively do add an "ick factor" to a costume. Anyone interested in wearing a costume based in raw, extreme horror roots will appreciate the bloody Oozing Wound Prosthetic Set. Perfect for all sorts of grindhouse-era monsters, madmen and freaks as well as all their victims. Fits well with virtually any horror costume concept. Woochie prosthetics are easier to use than you would think and the effect is amazing!
If you don't already have Spirit Gum or some other skin safe adhesive, you will want to grab some. Blood Gel is also a nice extra touch.