We used bullnose in our master bathroom as a finishing edge (top layer above mosaic all around, plus going up edges of the shower wall). We put a mosaic sheet inside a niche in the shower (the entire shower wall will be tiled with the wall tile, no mosaic, just not shown in this picture). Should we use the bullnose around the edges of the niche, or a brown metal edge? I'm thinking we don't have to be consistent with the bathroom walls since anyway the niche is more of an accent piece with the mosaic tiles. Thank you!