I stumbled across this fantastic promo-tchotchke/geegaw/bauble/dingus site, Coins for Anything (via Wired's ...Swag That Doesn't Suck).
So now I'm happily pondering a set of 100 special one-time-only coins to go with Hild--little presents for people who have helped me along the way. In some dull, heavy metal that looks like bronze. But what should I put on them? I could do an ammonite. A profile of Hild. A butcher bird (you'll understand if you read the book). A cross. A seax. All kinds of nifty things.
Meanwhile, here's a British coin I like: