In 2013 the Sioux tribe issued a series of fantasy pieces. The original idea came from The Native American Mint, which together with the organization Serving the Lakota held a designing competition. The coins were to be minted at the German company Numiscom, though it is unclear if these pieces have also been minted there as this company regularly outsources the coin production.
Some of the original drawings:
Designs by Victor Runnels (1 cent) and Merle Locke (10 cents)
Designs by Merle Locke (25 cents) and Shawn Slother (50 cents)
Designs by Morningstar Yellowbird (1 dollar) and Hope Conquering Bear (obverse of the series)