FWIW, my .emacs
file contain these lines, which seems to change colors for Fortran sources (I guess I consulted some page like this one, but do not remember details, sorry...)
(set-face-foreground 'font-lock-comment-face "green")
(set-face-foreground 'font-lock-keyword-face "lightblue")
(set-face-foreground 'font-lock-type-face "green")
(set-face-foreground 'font-lock-function-name-face "pink")
(set-face-foreground 'font-lock-variable-name-face "black")
;; the above colors are just random examples...
Also, we can change the color of %
(the selector symbol of type components) by
(font-lock-add-keywords 'f90-mode
'(("%" . font-lock-keyword-face)))
where font-lock-keyword-fact
is the color specified above. By using the above commands, it may be possible to customize the color as you like (to some extent).