Design a small bathroom with a shower in pin-up style. The walls feature playful pastel tones, like mint green and soft pink, with retro-inspired white tiles around the shower area. The compact shower has vintage chrome fixtures and a white shower curtain with polka dots, adding a whimsical touch. A round mirror with a light bulb frame sits above a pink vanity with curved edges. A few retro accessories, like a striped soap dispenser, fluffy towels, and a small pin-up poster on the wall, bring the style together in this cozy, vintage-inspired space.