Val Kilmer Is Selling His Gold Tumbleweed!

Val Kilmer's turning tumbleweed into gold, and a small fortune ... TMZ has learned.

Val is selling an actual tumbleweed he bronzed and dipped in 22k gold ... for a cool $150,000. Luxury boutique Just One Eye got the piece Tuesday in L.A.

We're told the piece -- aptly titled "Tumbleweed" -- symbolizes Val's childhood growing up in New Mexico. His granddaddy was a gold miner, so the art's got family roots. Plus, "Tombstone" ... 'cause that movie's awesome.

Good news for interested buyers, it comes with a Val signature.