(Image credit: Design Sponge)

Since it's often the smallest room in the house, the bathroom is a playground for anyone wanting to explore and experiment with different design ideas. Dramatic decor, which can overwhelm a bigger room, somehow manages to work well on such a small scale. My favorite look for bathrooms right now: rich and dark chalkboard walls.

Dark grey walls pop in bathrooms with light ceramic fixtures, and chalkboard artwork—whether deliberate designs or eccentric tags and sketches—adds tons of character. Plus, it's something to keep you busy during, ahem, longer restroom visits.

Here are chalkboard bathrooms that get it right:

(Image credit: Design Sponge)

In Tara Mangini and Percy Bright's Philadelphia home (featured on Design Sponge), chalkboard walls function as changable wallpaper with different designs.

(Image credit: HGTV)

A Hollywood Hills bathroom from HGTV pairs dark walls with pops of red.

(Image credit: Casa de Valentina)

A loft in Brazil from Triplex Architecture (via Casa de Valentina) with detailed graffiti.

(Image credit: Country Living)

This cottage bathroom wall from Country Living stands in for floral wallpaper.

(Image credit: Chango & Company)

A strong and stylish Brooklyn brownstone from Chango & Company.