The Nut and Bolt Wedding Ring. Another way to say: if you get married, you're screwed!
For a Green couple
Hello Kitty!
Cat 5 Compliant Ethernet plug wedding rings... can't get geekier than that
Ok, remember when we said it can't get geekier? We were wrong. Meet thebinary wedding ring
Yes, it's a ring with a vacuum tube
For the technician in you both...
Press one side or the other, it's the "Breathing Ring"