Adding lights as decorative elements helps set a mood in a space. Provided that general lighting is already installed using lights instead of wall art can be a decorative way to provide ambient lighting.
Instead of or in addition to sconces hidden lights can add a general glow that bounces off the wall and into the room in an even subtler and more diffuse way. Cove lights are built into niches that hide the light source (often a plain LED strip) but hidden lights can also be obscured by medicine cabinets shelving or storage units.
As you evaluate the status of your lighting style keep in mind that lighting also functions as art that helps define your style set the mood and perform practical tasks. Think of adding light in unexpected places such as a chandelier in the master bathroom. And consider using light in unconventional ways — such as using hanging pendant lights as reading lamps.