Since the front face is aluminum and the finish has nothing to do with performance, maybe they could offer a variety of colors since aluminum is rather easy to finish in any number of colors in a variety of finish styles. They appear to be anodized, and there would be basically no difference to get them in at least a dozen colors.
My speakers use magnetic grilles and the lip of the drivers actually does the locating.
I agree with Gene, they totally look like the older M&Ks. As soon as I saw them though, I thought "They look like Vance Dickason designs..." Sure enough...lol. He seems to tend towards simple and favors performance over appearance IMO.