I have done… before.
Jonas, you might have seen my controversial piano roll fantasy:
http://www.renoise.com/board/index.php?sho…1222&st=125
Down the page is a the most detailed and developed image/concept:
http://members.optusnet.com.au/~marty_f/20…iano_roll_2.gif
Annotated version:
http://members.optusnet.com.au/~marty_f/20…ano_roll_2a.gif
Many hours put into those. Probably a bit much detail to swallow in the one shot, not to mention being thrown off by the non-standard colour scheme 
EDIT: I just posted a virtual “bump” of the above images to the thread with a small commentary. The reaction should be interesting