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?