How To Set Colors for Priorities in Org Mode
Customize org-priority-faces
to set specific attributes for each priority:
'((65 :foreground "red" )
(66 :foreground "orage")
(67 :foreground "blue"))
The numbers 65, 66 and 67 correspond to the priority letters in ASCII e.g. 65 is A. This can be also written as ?A
in Emacs Lisp.