What would go well in a 33G?

This is really mostly just daydreaming about the possibilities for a soon to be empty tank, since my goldfish are upgrading from their 33G to a 50G. The tank itself is pretty old, almost as old as I am, but aside from the hood would still be in prime condition for a reptile of some sort. And though we probably will sell it (or give it to fish/reptile keeping friends), I also wouldn't mind holding on to it for a future lizard or snake pet. As a student, keeping an old tank > Buying new tank.

As for snakes, I have a good idea of what would fit comfortably in there, but I'm a little more curious as to what sort of lizards could be housed comfortably in a 33G? Some reptiles I've been eyeing are fire skinks, leopard geckos (2-3 females, perhaps?), crested geckos or a leachie (if I forgo the stand and turn it on it's side - vertical), and I also quite like collard lizards.

But what do you think would go well? And what would you put in there?