I was baptized in Poland, when I was several months old. A very common souvenir from such ceremonies in Poland is a golden cross which the kid can (some years later) put on a golden chain and hang around the neck. I also got one. It is now somewhere in my wardrobe, not being used for last x (x=13?) years, waiting for... nothing.
I have just got an idea: I will go to a goldsmith and ask him to melt this cross into the Darwin fish.
Quite a symbolic operation, isn't it? ;-)