Question: how to decorate a small living room without windows?
Answer: Mirrors. Adding a large mirror to your wall is one of the first ways to simulate the effect of a window, not just for bouncing some light but also for adding a sense of depth that breaks up claustrophobic wall planes. ...  White walls. ...  Large art. ...  French doors. ...  Hidden lights. ...  Transoms. ...  Internal windows. ...  Frosted glass.