Hmm. And on the other hand, "coins" and other treasure-related metaphors suggest that the aim of them is to pick them up and never let them go, whereas presumably there are plenty of interesting programming challenges involving picking them up and then putting them down somewhere else (perhaps so as to form a pattern, or some such). So perhaps purplerabbits's suggested metaphor of game pieces is the best direction to head in, suggesting that they're things you can pick up and put down in ways that are significant to you but they don't do anything of their own accord?