Paint is better than wallpaper in the bathroom because moisture can get behind the paper and produce mold. Ceramic tile and natural stone are also durable choices that will seldom need replacing, saving resources in the long term.

Floors

Long-lasting and easy to clean, recycled-content ceramic tiles and natural linoleum are environmentally friendly choices. Don’t use carpet in the bathroom; it traps moisture that can lead to mold growth. Natural linoleum (Marmoleum from Forbo, for example) is a sustainable material; vinyl is not.
 
Cabinets and Countertops

Avoid particleboard and medium-density fiberboard (MDF) in cabinets and as a base for countertops unless you can find low- or no-formaldehyde versions. Exterior-grade plywood is better, or use solid wood that has been certified by the Forest Stewardship Council (FSC) for sustainability.