Do you have any momentos (rings, necklace, figurine, etc.) or tattoos to commemorate your losses and rainbow babies?

I have a necklace that is in rememberance of our first loss (it's not obvious to anyone but me), but I'd like something that I can add on to for both our angel and rainbow babies. I was thinking of a necklace with some sort of charm that I can add birthstones to, but I think it might invite questions I don't want to answer.

DH and I are also considering tattoos to commemorate out heartbreaking journey...

What do you have or what are you considering? Bonus points for pictures!