When we took K for his first haircut, we ordered a calligraphy brush made from his hair. The other day we got a phone call to say that it was ready so H and K went to collect it yesterday. It came in a fancy wooden box and has K's name and date of birth written on it.
If you're planning to actually use the brush, they shape the hair and coat it, creating quite a stiff brush. If, like us, you just want to keep a lock of baby hair, it comes back like this, in all its fine, soft, natural glory: