I’ve recently gotten into doing a lot of lisp programming in emacs, and rainbow-delimiters-mode is a huge help in terms of visually finding your way around. What I wasn’t  thrilled with, however, was the default color scheme which is rather bland. So I decided to spice it up. So here’s some better defaults for rainbow delimiters mode:

(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(rainbow-delimiters-depth-1-face ((t (:foreground "dark orange"))))
 '(rainbow-delimiters-depth-2-face ((t (:foreground "deep pink"))))
 '(rainbow-delimiters-depth-3-face ((t (:foreground "chartreuse"))))
 '(rainbow-delimiters-depth-4-face ((t (:foreground "deep sky blue"))))
 '(rainbow-delimiters-depth-5-face ((t (:foreground "yellow"))))
 '(rainbow-delimiters-depth-6-face ((t (:foreground "orchid"))))
 '(rainbow-delimiters-depth-7-face ((t (:foreground "spring green"))))
 '(rainbow-delimiters-depth-8-face ((t (:foreground "sienna1")))))