The Cheapest Trick for Making a Small Bedroom Feel Bigger

The cheapest fix with the biggest visual payoff

 Forget paint and plants for a second the single cheapest fix I've found for a small bedroom is a mirror, and placement matters more than the mirror itself.

Put it directly across from your window. It reflects both the light and the outdoor view, which visually doubles the sense of depth in the room. A $20 secondhand find works just as well as a new one.