http://www.scribd.com/doc/252772385/...ry-Dahl#scribd
I'm not sure this will help, but this is the guide that came with the original pet rocks. Either way, it's hilarious. I especially love where it goes into wild rocks.
Maybe you could think about "body condition" and "health" of the rock. For body condition, you could have the kids draw or take pictures of the rock when they get it. If the rock gets chipped and isn't glued, it is in "poor condition". As for health, if moss or lichen is growing on the rock, or if it is dirty, it is "sick". Sick rocks must be cleaned and left in their cage for a few days to heal. You could also request weekly bedding changes.
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