I haven't but my sister's friend had a little girl who died when she was around 2. She then went on to have 2 boys who are fine and then got a tattoo of a big angel with "Sammy Jo" (her daughter's name) written on and with two smaller angels either side with her boys' names on (Ryan and Jake). It is so lovely. Every time I look at it, I get goosebumps.
I am a tattoo addict though, I have 6 (all in places where people can't really see, except my foot and my wrist) but I just don't feel any need to have one as my miscarriage happened so early and also, I probably have no space left for another one!