To make a thrifted bedroom cozy and warm, use a palette of soft warm neutrals on walls and furniture, layer lighting with rescued lamps casting ambient light, and incorporate plush textiles like thrifted rugs or curtains. Group vintage objects for an intimate feel, include plants for life, and style shelves with personal collections. Painting mismatched furniture uniformly adds calm cohesion. These touches create an inviting eclectic vintage space full of personality and comfort.