Dreamspinner, there was an issue of Dragon magazine (#50 - I'm probably dating myself by mentioning this; my first issue was #37) that had a dragon creation system where alingment was as random as skin color (i.e. biased towards dark colors and Neutral/Evil alingments, but anything was possible)... After college, to keep in practice, I converted this to a Pascal program and expanded it to create gem, metallic, and chromatics at random... I had a lot of free time on my hands back then... But my upshot here is that, yeah, I don't think Dragon colors should dictate alignment or breath weapons for that matter (and loved to surprise PCs with strange dragons; had one Blue dragon manage to talk the PCs out of killing her by seeming more powerful than they were, trading them the "tacky" item they were looking for for some gems that matched her color scheme, palming off two cursed items on them, and flying them out of her cave...)