A circular rug is always a great way to help make a statement, a little bit like a permanent spotlight. Use the rug to draw the eye to a feature piece, placed in the centre. Just make sure that the rug colour has enough contrast with the floor to truly demand attention!
Rounded edges and circular forms were a strong trend at the recent 2018 Salon de Mobile (a trade show in Milan that often sets worldwide trends). These plump ovular shapes give a friendly, comfortable appearance to any setting. The cartoonish quality of these forms also creates a great contrast with more angular pieces.