Reddish? Hadn't thought about that, but I'm sure it would be pretty. I was aiming at lightening it up ... so gonna have to lay some out and see if I still feel dark.
A button centered in every other block? I'd thought about one at each intersection, but that would be a LOT of buttons. The blocks are 4 inches across, but the top and bottom row are shorter than the center row. Had to do that to make the blocks match the size of the panel, but use the center block as is.