I have always been curious of how Briarlight and Blossomfall wern't gray, but dark brown and tortoiseshell. Graystripe is gray, and Millie silver. Then I remembered that Diesel was a brown tabby, and he had black stripes like Bumbleflight's. What if Diesel is their father?
In the Graystripe and Millie comics, Millie was shown as a pale brown tabby. Is it possible that the Erins made the descriptions of the kits based on the comics? Briarlight would have gotten her brown coat from Millie.