Artist and Designer Frank Tjepkema (aka Tjep.), has a fun series of solid sterling silver rings based on the pixelated alien invaders in Taito's classic arcade game, Space Invaders.
Invader Aiko ring:
Invader Hoshi Ring:
Invader Yuki ring:
Shop for them and other Tjep products here.
To learn about tons of other products inspired by the aliens, check out one of my favorite fellow blogger's sites, Technabob