I've allready sucessfully made the sky dark grey and the clouds black. THere's one for the sky, two for the planets, one for halo and then there's one fore the sun (these are all obvious locations on Bolls lists). You can assign other bitmaps to them (I used a dark grey metal plating) to make the sky totally grey. This works well, but the light sources are still there ... I haven't found anyplacee to edit those light sources yet.