If —sorry, when— I get axolotls, I have every intention of tracking down some large marbles/glass paperweights like yours, Nikki. It looks gorgeous— and there's no chance of them swallowing them, and they should be easy to clean! Are they?
Fleamarkets/Antique shops near me seem to have them occasionally, as well as charity shops, and I've seen some in toy/gift shops.
There are so many cute critters in this thread!
Are any of you on Tumblr? One of my friends showed me a tessellated pattern with lots of different colour drawn axolotls. The artist is happy for people to use it privately, or publicly, if they're credited.