I'm DM-ing a Forgotten Realms game. My players are:
• Human paladin of Torm
• Human two-weapon ranger
• Eladrin orb wizard
• Half-dragon warlord (homebrew race, see below)
In my 3.5E FR campaign, my wife played a cleric of Sune who had a daughter with a gold dragon. Fast forward 100-ish campaign years, and that half-gold dragon daughter is my wife's current character. I based it on a dragonborn, with a few minor alterations. She has low-light vision and a d8 fire breath weapon (due to the less-diluted dragon bloodline), but does not get the extra hit points dragonborn get when they use a healing surge. And the skills are a little different: +2 Perception, +2 Diplomacy. That's it - easy metallic half-dragon. Then, purely as a flavor thing, she has a touch of the gold-dragon's shape-shifting ability: she looks pretty much human except for some areas of fine gold scales and golden eyes, but can take on slightly more draconic features, like when angered, for instance. No effect on mechanics, though.
For a half-chromatic dragon, I would swap the +2 Diplomacy for +2 Intimidate, and of course the breath weapon is always dependent on the parent dragon's color. Half-dragons are treated as dragonborn for qualifying for racial feats.