I've already installed it, and now I find myself wishing I'd just gone for the square one. I'm having a hard time imagining how in the world to tile around this so that it looks good. I'd planned on using 1" square mosaic on the sides and back of the niche, and transitioning this to standard 4.25" field tile on the walls and the face of the niche. I'd considered either using matching bullnose tile at the edge to cover the edges of the mosaic, OR running rope tile that's glazed on the sides around the perimeter.
However I'm stumped as to how to handle the top radius of the niche. The only possible solution I can think of is to cut many pie shaped pieces out of bullnose tile, but I'm not very confident that this will look right.