The chromatics could return if some escaped Nefarian's clutches.
For flights I'd like to see, well as an old term Dungeons and Dragons player;
Gold Dragons
Silver Dragons
Steel Dragons
Copper Dragons
Crystal Dragons
Amethyst Dragons
Ruby Dragons
Emerald Dragons
Force Dragons
Prismatic Dragons
Hmm, thinking of this, in a crossover, how the average Dungeons and Dragons character would react seeing Alexstrasza, considering that red dragons are in that universe the most vile of the vile of beings.