The main reason that chaos and order shields aren't colorable/laminatable is that, in the past, there have been a couple of quests in which colored shields have has special significance. I know, for instance, that there are several red shields that are a relic of a quest from quite a while back (don't remember what the quest was right now, though
) I'm not really sure if they should be dyable, or if they should remain 'reserved' for seer use...