old goat
Tele-Holic
I've heard of quite a few people using dog bone (it's cow shin bone) to make blanks.
But there again, bone blanks are only $3 and change from places like StewMac and they save a lot of work!
2 problems:
1)You can't use this if you have a dog.
2) You never know if you're getting right foreleg, left foreleg, right hind leg, or left hind leg. Makes all the difference in tone.