They do make a wonderful decorative and even wearable collectible as they are not too fragile and can be gently cleaned with water. The celluloid are the trickiest to store as heat is a serious problem. If you decide to start acqurign these, just remebr that replacement stones are very difficult to find and broken combs are almost impossible to repair. And beware crackling in the cellluoid - it means the dreaded disease has struck and the entire piece will die.
Here's trio I just posted up at Past Perfect:
3 celluloid Combs, Top Left: Victorian French Ivory, Top Right: Edwardian Deep Green Celluloid w/blue stones, & Bottom: c. 1880s dark natural tortoise tone w/ jet cubes