1. Glass installation. This multi-layered wall treatment was custom made from colored glass. This is really thinking outside the box when it comes to what to put on the wall. Absolutely beautiful.
If glass feels daunting to you, consider creating an installation from panels of clear acrylic. You can back-paint the acrylic to make it any color you want. It wouldn't look the same as this, but my mind just gets going with ideas when I see such creative wall treatments.