I think there are some mamas who froze theirs to bury later when they had a place to do so.
I did not keep mine. For whatever reason, I couldn't bear it. I kept it for about 24 hours and then got rid of it. It was, perhaps, a very regrettable decision. I don't know, I really don't. I'm not far enough out yet to know whether it was a mistake or not, if that makes any sense. Given the chance to do it over, I probably would have frozen it and/or buried it in the backyard so that I wouldn't regret it.
Monica, mom to Lilly (7) and Carter (4) and rainbow baby Elsa (11/27/10).