How about having one of these fittings? Even if you haven’t thought much about purchasing such elements, you can still make a good use of them. And, as you can see below, they are quite good looking so why don’t you browse through these photos and pick something for yourself?
4.5'' Drain Fitting
A humble and functional drain fitting which is fully made from polymer. It's constructed the way to be durable and provide high quality. It was manufactured in China. Overall dimensions: 3" H x 4.5" W x 4.5" D.
4.44" Drain Fitting
A drain fitting which is fully made from polymer that provides high quality, strength and durability. It is suitable for most contemporary bathtubs. It is functional with a minimalistic design. Its dimensions: 2.25" H x 4.44" W x 4.5" D