To clarify, is what you have the butt end of the shed antler, or the actual skull bone with the antler attached? Technically the pedicle is part of the skull, where the antler growth begins. The external, bumpy round part of the antler is the burr. Anyway, if it is just a flat round disk, the burr makes a very cool looking recepticle for the point of a pen when the other end is supported by a pair of crossed tips or a forked antler on a desk stand. If it is big enough around, and long enough, I sometimes turn it into the cap section for a desk pen. In either case, If you can't figure out a good use for them, I'd be happy to trade you out of them. PM if interested.
If the antler is still attached to the skull, I always try to saw away enough of the skull to turn the entire section into part of the pen, showing the "skull line" all the way around the blank. I usually double the price of a pen if I can get a complete joint line to show up prominently.