So
All dragons aren't the same, so you'll see variation - especially with creatures as powerful and already-unique as dragons.
You should be comfortable making this up yourself. Information on stuff like that tends to be spread across many books and is often done by example (oh look, a mated dragon lair) as opposed to a diatribe on dragon mating.
Having said that, apparently you have Dragons Revisited but haven't read it and want us to for you? It has such information, varying by breed. For example, black dragons:
Territoriality
Through careless pogroms and
occasional genocides, black dragons drive off or slaughter
all living things surrounding their lairs, creating wide
swaths of barren swamplands.
(among other details)
Mating
The slinking “loser” is the female, who slips away to return to her
own domain and begin the process of readying for her eggs,
letting the male attract attention to himself while she nests
in safety. After mating, the male has no more connection
with the female or her eggs, and if ever again the two meet,
they treat one another as bitter and hated enemies. Females
can lay eggs roughly a dozen times in their lives, and every
time they do so it is with a different male partner.
Whereas e.g. brass dragons tend to be nomadic. They go into pretty specific lair detail on all of them, but not dragon-sex-and-mating detail, you may need to DIY until the Book of Dragon Erotica comes out next year. Just by plain example, most dragons they depict are solo, but in e.g. Dragons Unleashed they refer to the white dragon Sjohvor saying, "Nearly 900 years ago, Sjohvor had a mate with whom he shared his lair." So it's not unheard of, but seems to be rare.
Most of the same skin tones of real life modern humans appear in major D&D settings.
D&D 5e Player's Handbook p.29 says:
Human skin shades range from nearly black to very pale ...
Pages 30-31 describes nine ethnic groups of the Forgotten Realms, whose skin tones are variously described as dusky brown, tawny, fair, amber, yellowish-bronze, and dark mahogany.
The Sword Coast Adventurer's Guide, p.110-112, adds descriptors of tan, dark, olive, pale, tanned, bronze, and golden. This seems to cover most of the possible values of real-world modern humans.
The peoples of the World of Greyhawk are described in the D&D 3e Living Greyhawk Gazetteer as variously having golden, bronze, tan to olive, rich red-brown or dark brown, and fair. The Suel in particular have a higher than average rate of albino people.
I faintly recall Eberron's creator suggesting that humans born in unusual circumstances, such as during a planar confluence, might be born with rare skin tones, such as green or blue. However, I don't believe this was a canon article, and the official Eberron books tend to gloss over details of human skin tone.
Best Answer
A unique and highly unusual new dragon offspring, who is typically sterile
The D&D 3.5 sourcebook Draconomicon (2003), p.27 asserts that dragons of different types can produce hybrid offspring:
The AD&D 2e Draconomicon (1990), p.64 describes that chromatic dragons can interbreed. The majority of such creatures are infertile, and therefore do not continue to produce offspring. Their coloration is a blend of the parents' color, and many other attributes are a half-way between the two parents, such as size and other details of physical appearance.
The breath weapon of a cross-breed dragon is usually that of one of its parents, but sometimes it is a combination of the two. They tend to learn the behavioural patterns of the parent who raises them.
The result of two metallic dragons breeding are more unpredictable and sometimes bizarre. These are rarer, with most interbreeding taking place between chromatic dragons (Draconomicon (1990), p.12).
Crossbreeds between metallic and chromatic dragons are extremely rare, but are known to happen. Their traits are highly variable and unpredictable, even more so than the offspring of two metallic dragons.
Bronze dragons particularly mate for life, and take courtship and mating very seriously, making a bronze hybrid less likely, but they care for their offspring with dedication. Blue dragons similarly have elaborate courtship rituals and care for their eggs (Draconomicon (2003), p.40), so a hybrid between these two types of dragon may well survive to adulthood. The exact traits, however, are unpredictable.