Effective gallery walls feature thrifted paintings or prints spaced two to three inches apart, creating balanced visual rhythm. Start with a focal piece, like a thrift-store tiger painting that becomes your palette hero, and build around it. Use lightweight frames unified by color or style for cohesion. Layout galleries digitally before hanging to ensure proper spacing and arrangement. This DIY approach turns secondhand art into a compelling bedroom focal point that complements eclectic vintage decor.