
TheDisgaean |
I found some bits of Homebrew for additional Chromatic and Metallic Dragons here.
It's a bit incomplete in places, but some of the abilities and lore are interesting and creative.
My favorites have to be the Yellow and Pink dragons.
Pinks make their lairs in coral wreathes, are evil counterparts to the whimsical Coppers (think the Joker), and their breath is a cloud of bubbles filled with freezing gas/liquid.
Yellows meanwhile, are described the "fools' gold" of dragons. They're often mistaken for gold dragons and use that to their advantage to manipulate gullible mortals. However, they lack the Golds' abilities, including their signature fire breath (they're lightning breathers), forcing them to go to great lengths to conceal their true nature (Ex. Hunting during storms, using magic to pretend to have fire breath, killing anyone who learns the truth, etc.).

Mad Master |
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In my (massive) pile of homerules, I devised a new, standardized list of 10 generic damage types. Following that, I had the (probably) insane idea to rewrite all the standard dragons so that each one is resistant to physical damage and immune to one of the other nine types, while at the same time being tied to a specific kind of environment or theme (not color, metal or alignment). I called them "environmental dragons" and they are nine in total:
Fire dragon - A volcano-loving version of the red dragon with more fire related powers, such as people igniting after being hit by its physical attacks, breath weapon, or aura of heat. Obviously it's immune to flame (and not vulnerable to frost).
Winter dragon - A rethinking of white and silver dragons, not as stupid as the first and more ice/snow oriented as the second. He can chill and slow those it hits with its physical attacks, breath weapon, or aura of frost. Immune to frost (but not vulnerable to flame).
Storm Dragon - A conbination of blue and bronze dragons, but with powers tied to lightning and wind, such as a "wind shield" protectimg it and "static discharges" hitting nearby foes. Immune to lightning.
Sylvan dragon - A tweaked up green dragon, turned into a poisonous beast with a powerful, corrosive breath weapon and poisonous bite, claws and defensive spines (hitting who hits it). Immune to alchemical.
Swamp dragon - A renewed black dragon based on decay. It causes deseases with physical attacks and defensive spines. It's immune to void damage, which is also the type of damage of its breath weapon.
Sand dragon - Another combined dragon between what was left of blue and some old oddities from 2nd edition AD&D such as the yellow and brown dragons, all three living in deserts. Its based on a "mirage" theme, with a host of defensive and offensive illusions. It's immune to force, with a force-based breath weapon.
Song dragon - Based on another oddity from the past, it has bardic abilities and sound based powers. It's immune to thunder, with a powerful stunning, thunder-based breath weapon.
Sun dragon - Combination of gold and the old mercury dragon, it can reflect rays and lines effects and dazzle his enemies with sunlight and its reflecting scales. It breaths light and is immune to it.
Blood dragon - A rethinking of one of my favorite dragons, the fang dragon from Forgotten Realms, it's a level draining monster that inflicts bleeding with its physical attacks and defensive spines. It's immune to spiritual damage.
Maybe you can take some ideas for your dragons from those.

Cole Deschain |

While I think we have too many, at this point...
Dragon Magazine #170 gave us the "Ferrous" dragons...
Cobalt, Chromium, Iron, Nickel, Tungsten... Think they're already listed in one of the big bad voodoo daddy posts from before, but I found them strangely interesting.
Maybe 'cause I was younger when I first read that article and wasn't so burned out on clades of five true dragon types.