possible values for r_floorcolor / r_wallcolor

Hi I'm trying to get this look with the 0.7 beta:




I assume I need something like this:

seta r_drawflat "1"
seta r_floorcolor "grey" 
seta r_wallcolor "grey"
seta r_lighting_greyscale "1"

But r_floorcolor r_wallcolor don't seem to work, also tried tried "^7" and "#cccccc". Maybe I'm being dense here but what kind of values can I put in those?
(updated 2012-06-17 15:35:09)

i think it's rgb value no?
so r_wallcolor 128 128 128 should work?

That did the trick, thx!

iirc, you can set colors with RGB values (I'm using floorcolor "110 110 110" and the same for walls)