Set gnus-signature-face to grey.
--- a/.emacs-my Thu Aug 09 22:01:57 2012 +0300
+++ b/.emacs-my Thu Aug 09 22:36:52 2012 +0300
@@ -1496,7 +1496,10 @@
;; (setq mail-user-agent 'mh-e-user-agent)
-(custom-set-faces '(gnus-summary-cancelled ((t (:foreground "plum" :background nil)))) )
+(custom-set-faces
+ '(gnus-summary-cancelled ((t (:foreground "plum" :background nil))))
+ '(gnus-signature-face ((t (:foreground "grey"))))
+ )
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(message "bbdb")