mmm-try.el

(add-to-list 'load-path "~/src/emacs-starter-kit/src/mmm-mode")
(require 'mmm-mode)
(setq mmm-global-mode 'maybe)

(mmm-add-classes
 '((embedded-org-css
    :submode css
    :face mmm-declaration-submode-face
    :delimiter-mode nil
    :front "#\\+begin_src css"
    :back "#\\+end_src")
   (embedded-org-emacs-lisp
    :submode emacs-lisp
    :face mmm-declaration-submode-face
    :delimiter-mode nil
    :front "#\\+begin_src emacs-lisp[^\n]*"
    :back "#\\+end_src")
   (embedded-org-ruby
    :submode ruby
    :face mmm-declaration-submode-face
    :delimiter-mode nil
    :front "#\\+begin_src ruby"
    :back "#\\+end_src")))
(mmm-add-mode-ext-class 'org-mode nil 'embedded-org-css)
(mmm-add-mode-ext-class 'org-mode nil 'embedded-org-emacs-lisp)
(mmm-add-mode-ext-class 'org-mode nil 'embedded-org-ruby)