(define-key org-mode-map (kbd "C-#") 'org-begin-template)
(defun org-begin-template ()
  "Make a template at point."
  (interactive)
  (if (org-at-table-p)
      (call-interactively 'org-table-rotate-recalc-marks)
    (let* ((choices '(("s" . "SRC")
                      ("e" . "EXAMPLE")
                      ("q" . "QUOTE")
                      ("v" . "VERSE")
                      ("c" . "CENTER")
                      ("l" . "LaTeX")
                      ("h" . "HTML")
                      ("a" . "ASCII")))
           (key
            (key-description
             (vector
              (read-key
               (concat (propertize "Template type: " 'face 'minibuffer-prompt)
                       (mapconcat (lambda (choice)
                                    (concat (propertize (car choice) 'face 'font-lock-type-face)
                                            ": "
                                            (cdr choice)))
                                  choices
                                  ", ")))))))
      (let ((result (assoc key choices)))
        (when result
          (let ((choice (cdr result)))
            (cond
             ((region-active-p)
              (let ((start (region-beginning))
                    (end (region-end)))
                (goto-char end)
                (insert "\n#+END_" choice)
                (goto-char start)
                (insert "#+BEGIN_" choice "\n")))
             (t
              (insert "#+BEGIN_" choice "\n")
              (save-excursion (insert "\n#+END_" choice))))))))))