Creative Ring

Mourning ring - A ring worn in memory of someone who has died. Also commonly called a "memorial ring".
Multi-finger ring - Two or more laterally conjoined rings, designed to be worn on two, three, or four fingers; popularized by hip-hop culture.
Pinky ring - A ring worn on the 'pinky' ("little" or "fifth") finger.
Posie ring - A ring with a short inscription on its outer surface. These were commonly used as engagement and even wedding rings.