Well, there is nothing stopping you doing that, but it would not give you the effect you are after. You’re after a nice brick pattern, what you would end up with is two large blocks of red, with a block of grey on top, as you’ve probably seen.
Only one colour per voxel I’m afraid
You could try something like this. It’s a quick effort and needs some work, but it should give you an idea:
A little less repetition in the pattern, and a little more variance in the colour, and it could pass as a brick wall.