Man is most nearly himself when he achieves...
We don’t stop playing because we grow old; we grow old because we stop playing.
Arrgghhhh - colour ! All that colour !This is completely understandable and it's your choice, of course (unless you go pastel - let's just not even address that)!
More seriously, I was loathe to upgrade my components without sticking to the greyscale nature of the game. Perhaps white (Gore), grey (metal) and black (shadowflame) cubes in three sizes might work for resources ?
I saw red used in my buddy's enhancing of the game and liked it. It fits with the theme of gore and I like to think that red has at least a visitor's pass in the monochromatic black country of evil metal.