Buy satin gray plastic wall switchplates and screwless receptacle covers made in USA. Note that gray screwless light switch plates are only manufactured in six sizes (decor rocker openings for 1-6 gangs). See gray metal wall switch covers for more than 100 sizes.
Plastic screwless covers by Lutron are high gloss.
Lutron wall plates have a visible seam along the sides.
Blank screwless covers are not made, but they can be created by adding rocker dummy switches to fill screwless plate openings where needed.
