When it comes to inhuman but strangely sensual monsters, it's hard to top H.R. Giger's original Alien design, and artist Kilroy's Attic didn't attempt to improve on perfection. Instead, he made that unforgettable image the launching point for the “Sexy Beast,” the first in a series of transforming rings that unfold into “knuckle-duster” style mock hand weapons.
While the fully-transformed piece is worn like traditional brass knuckles, don't expect to put it to defensive use, since it's actually made of vinyl resin. The Alien's head becomes the palm segment which locks the unfolded ring base into position.
The ring is available in sizes 6 through 11.25, and is selling for $55 at the artist's Etsy shop, along with other transforming ring designs.
Be sure to keep an eye on the Kilroy's Attic blog for future variants on the xenomorph theme (with photos of works in progress), and check out this demo of the ring's transformation: