These rings from shapeways shop Ammnra Creations are pretty cool. Sadly they’re not meant for me; they all look awesome in the pictures below, but they come unpainted and I really do not have the talent to paint them as precise as that myself.

Mass Effect Thermal Clip N7 Ring

Mass Effect Omni-tool Ring

Mass Effect Garrus’ Visor RIng

Portal GLaDOS Ring

Portal Space Core Rings

Assassin’s Creed Apple of Eden Ring

Assassin’s Creed Apple of Eden Pendant