Celegorm the Fair

Where does it ever say Celegorm was blond? Yet it seems almost fanon that he is. I don't buy that as I think Tolkien meant golden hair to be an exclusively Vanyarin trait (ok, we have the Woodland King described as golden-haired, but I have a whole other headcanon on that which I won't go into here). Celegorm "The Fair" to me has always meant "beautiful", so he's probably the most handsome among the seven sons (Maedhros the "well-shaped" one would have had the hottest bod I guess, and Celegorm the best face). I also headcanon him as silver-haired, as he could have gotten the genes from grandma Miriel. I have seen too few artists paint him as a non-blond, and I've always been happy when I do, so here's one more silver-haired Celegorm. 
Detail of a larger painting with hounds that I did. This is after unrequited love/lust for Luthien, after Huan abandoned him, after he was booted out of Nargothrond, after the Nirnaeth Arnoediad, and I imagine he's somewhere in Ossiriand.

[See the discussion in the comments to find out exactly where it says Celegorm was blond!]