I use the config John mentioned and I like it - though I use different
symbols. Here's my config if you want an example:
https://github.com/zzamboni/dot-emacs/blob/master/init.org#source-code-blocks

--Diego

On Tue, Jun 2, 2020 at 9:24 PM John Kitchin <jkitchin@andrew.cmu.edu> wrote:
>
> Here is one approach:
>
> https://pank.eu/blog/pretty-babel-src-blocks.html
>
> I feel like I have seen some work that used ruby and python icons as displays over #+begin_src, but I can't find it now.
>
> John
>
> -----------------------------------
> Professor John Kitchin
> Doherty Hall A207F
> Department of Chemical Engineering
> Carnegie Mellon University
> Pittsburgh, PA 15213
> 412-268-7803
> @johnkitchin
> http://kitchingroup.cheme.cmu.edu
>
>
>
> On Tue, Jun 2, 2020 at 2:54 PM William Denton <wtd@pobox.com> wrote:
>>
>> Is anyone doing any fancy formatting of source blocks, such as putting a line
>> in the left fringe, or a box around them, or having some interesting background?
>>
>> I ask because I recently changed the theme I use to get the dark Solarized look
>> I like,[1] and all of a sudden my #+begin_src lines were underlined and
>> #+end_src had a line above it.  These come from org-block-begin-line and
>> org-block-end-line, and are shown here, but I'd never noticed them in
>> documentation or had them on my screen before:
>>
>> https://orgmode.org/worg/org-contrib/babel/examples/fontify-src-code-blocks.html
>>
>> Aside from fontifying the source blocks I've never done anything special about
>> them (except wonder how I ever did anything without them), but seeing this made
>> me wonder if anyone here has really customized them so they look like medieval
>> manuscripts or something from a futuristic video game.  (If any of that is
>> possible---but in Emacs, anything is possible ...)
>>
>> Bill
>>
>> [1] Now I'm using https://github.com/bbatsov/solarized-emacs, with variable
>> pitch turned off and Org headline resizing turned off.
>>
>> --
>> William Denton :: Toronto, Canada   ---   Listening to Art: https://listeningtoart.org/
>> https://www.miskatonic.org/         ---   GHG.EARTH: https://ghg.earth/
>> Caveat lector.                      ---   STAPLR: https://staplr.org/
>>