A dfhack plugin that messes with rendering.
In command line:
rendermax trippy - randomizes colors for fun
rendermax truecolor red|green|blue|white - a simple testing command
rendermax lua - a lua interface for writing custom rendering things
rendermax light - lighting engine with awesome stuff
rendermax light reload - reload the settings file
rendermax light sun <x>|cycle - set time to x (in hours) or cycle (same effect if x<0)
rendermax light occlusionON|occlusionOFF - debug the occlusion map
rendermax disable - probably will crash :/

Install:
put dll into hack/plugins
put lua file into same dir as df exe file is.
for best effect set black (in data/colors.txt) to non-black e.g. :
[BLACK_R:40]
[BLACK_G:40]
[BLACK_B:40]