It's Tiger Myrtle from Tasmania here in Australia. It's a type of spalting in the myrtle tree and is rare to find and you don't normally get it this good usually its dull and hard to see the black lines. I have got a few prepared blanks if any one is interested drop me an e-mail.
I plan to do a few more tigers tomorrow in different styles will post some pics when they are done. I would go out in the shop now but its 10:30pm right now and aint got any lights lol