Dimmed Preview added to .watch

Speaking with the owner of FaceRepo about having a dimmed preview in addition to the main preview on the site... we decided the ideal solution would be if WatchMaker when building the .watch file would keep the preview.jpg as the normal/bright preview, but have something like dimmed-preview.jpg to show what the dimmed version looks like.

I have some dimmed versions of some of my watches that I prefer over the bright, so I would like to show those off. FaceRepo had mentioned he had thought of doing the same thing, but that the uploaders could upload just any old image and turn FaceRepo into an image hosting site.

Please consider this as it would be beneficial to the community, especially those who use FaceRepo.