Don't recall if anyone mentioned this, but I think not.

When I was initially thinking about whether to go with 'un-changed aluminum look' or the black one, my biggest thought was that the metal band around the screen would still be black, which to me would look unappealing.

But today I noticed that there is by now a LOT of generic 'white' body replacements for the Nokia N900, and they all have a fittingly silver-y looking screen-surrounding band. Here's one example of such auction, but you should be able to easily find more:
http://www.ebay.com/itm/White-Housin...-/121433760971

Just thought I'd mention it here, in case someone was also considering an aluminum looking one but was put off by the screen metal band thing being black.