[O] Nice theorem display ?

[Joon Kwon]

Hi,

I'm a new orgmode user and I am really enjoying it, especially for writing 
LaTeX documents.

I'm wondering if there is a simple way to make the buffer display theorem 
environements (for instance) in a nice way...

For instance, if I have the following code :
#+begin_theorem
My theorem
Bla bla bla
#+end_theorem

I would like the buffer to display something like :

Theorem : 
 | My theorem
 | Bla bla bla
 +----

I guess this must not be difficult for elisp programmers ...

Joon