I like my takedown bow, but I'm less-than-thrilled with the plastic knobs on the limb bolts.
Unfortunately I don't care much for the antler rosettes either (kind of look like flowers to me), so I was looking for something different. I always liked the intricate pattern inside a black walnut when you section it with a hacksaw, so I took some of those, imbedded the bolt and filled with epoxy. I put India ink in the epoxy to make it black. I also put backing of 3/16" maple board to strengthen it, and rubber washers.
Here's the final result. Turned out pretty cool, IMO. Kind of wicked looking!