[quote=RoflsMazoy]
I've been thinking maybe of doing a metal dragon and a crystal dragon. Would that be a good idea?
[/quote]

If so, then crystal, by its nature, is based in ionic bonds. (Most crystals, if high school chemistry has taught me anything.) Crystals actually grow in very predetermined paths, so crystal would be interesting as far as order. Perhaps emotion for chaos, like what Alpha suggested.