wordwalker
Auror
Deities and colors affiliated with them...
Nicely thought out. Still, when you have fifteen deities, giving them simply a color may not be enough because it's hard to resolve that many fine variations in color. (Or it just sounds awkward describing so many. I tend to stop at the three primary and three secondary colors plus black, white, and gray.)
You might adjust this by giving each one not precisely a color but an icon, some object that represented them. If that object included a particular shade of color (eg a bloody claw) that color would still be used on most of the deity's things, but the icon makes it all easier to describe.
(Or there's the Amber approach that everyone uses a combination of at least two colors. But that evokes human heraldry more than divine focus.)