Different species of mine have different themes to make it easy. Well, easier, anyway.

BPs: Irulan (before the element thing came up), Iridium, Tungsten, Ferrum, Palladium, Beryllium, Xenon, Europium, Uranium, Iodine ("Bitey"). I try to match the colors or other properties of the elements to the snakes' morphs.

GTP: Malachite (any future ones will be named after blue/green minerals).

BRB: Isis.

Bearded Dragons: Leto, Ghanima, Stilgar (Dune characters).

Leopard Geckos: Zathras, Nubbins.

Fat-tail Gecko: Geneva (future fatties will be named after types of chocolate).