Geckos are always a fun choice... leopards and cresteds/gargoyles are ones I've dealt with, and they are friendly and easy to care for. Cresteds would enjoy the extra height if you set it up on it's side.
EDIT: I like to go on Kingsnake and look at all the lizards and geckos that are listed there. You could get a trio of house geckos for that set up... there are a bunch of species to check out. Email the seller or google the requirements - see what's out there!
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