Well...They'll have to look very foreign and not like the normal creatus that are based on animals, then. Your drawing is a great example of a foreign looking creatu. I really would like to have one of those.
Maybe the moon can have four to eight creatus, but different ones come out depending which planet the moon is orbiting around at the time while the rest hides from the change in the moon's surface, but even then, it's hard to find an egg of those creatus to keep them valueable.
One of those quests the moon can offer is finding colored moon rocks while you're hunting eggs and turn those stones in for either tu or an item out of this world.
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