fireplace trim). Mount a row of grills horizontally across the wall and put the stone above and below them and make it a horizontal design element. Paint the wall black behind the fakes and paint the inside of the duct black and you'll not see any difference between the real air return and the ones just
tubing, copper pipe instead of a grill. Or, if the return is exactly centered, picture frame it and get a cool piece of metalwork for the grill.
amount of copper/slate roof above one of the downstairs windows? maybe if french doors opening to uncovered terrace (maybe under a wood "awning") then something like this over the french doors and then regular full length window on the other side?