I didn't want to hijack the "show us your kilt pins" thread with this question, but I've seen a number of mourning brooches on ebay, and I was wondering what the thoughts were on using one for a kilt pin?

Due to the original purpose of these pins, they are almost all black, or at least very dark in color. I have seen a few in carved bog oak that I think would really show up well on a light colored tartan.