Updated. I penciled the SLAs in where I thought they'd fit, and assigned some usages. Feel free to debate 'em if you think they should change.
We could probably use another SLA for Adult. I'm not fond of rainbow pattern or scintillating pattern, though. How about displacement?
Or perhaps, instead of another SLA, the ranger's camouflage ability?
Camouflage (Ex): A ranger of 13th level or higher can use the Hide skill in any sort of natural terrain, even if the terrain doesn’t grant cover or concealment.
RavinRay - I can't seem to locate your Opal Dragon. Would you mind posting a link, or just the breath weapon text?
Here's my opal dragon breath weapon verbatim. Good thing I brought my D&D flash drive along.
Breath Weapon (Su): An opal dragon has one breath weapon: a cone of multicolored light that works like the color spray spell except that it also causes hit point damage, even to sightless creatures.
Thanks!
Updated.
Skills: Bluff, Disguise, and Hide are considered class skills for chameleon dragons?
*Can also cast cleric spells and those from the x, x, and x domains as arcane spells.
Trickery? Animal? Law?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.