Redwood Burl from Pop's. I visited his place back in 2011 and got about 15 awesome pieces and scale sets from him. I was like a kid in a candy store. Need to go visit him again. He's got stuff he doesn't even remember where he got it. Wife said she would not let me go alone!
Many different woods on different knives and there is so much variation that some abundant renewable & common woods can be amazing after stabilization.
California Buckeye comes to mind first, Maple in all of it's variations and Red flame ash, plus many more