Mix vintage and new pieces in bedroom design by following a seventy to thirty ratio favoring vintage. Select new items that complement vintage elements in style and color, such as warm neutral rugs or modern lamps with vintage finishes. Paint vintage furniture the same tone as new pieces to unify the look. Balance textures by pairing smooth modern fabrics with weathered wood or brass. This intentional blend creates a fresh yet soulful bedroom that feels curated over time, perfect for a relaxed eclectic vibe.