Christy Ferer says that bathrooms have long been oases of privacy. These days, that fact is celebrated and exploited in dozens of ways. Add a padded garden bench, chair, chaise longue or even a small sofa. This gives a place to visit - for getting dressed, giving haircuts, or polishing nails. That it's a bathroom doesn't mean it can't have a wonderful little table for holding makeup, toiletries, and so forth, or a bookshelf, magazine rack, display cabinet, or curio cabinet for stacking reading material, a pad, pen, and family pictures.
Bathroom decoration does not need to be different from the rest of the house. Try anything that you'd use in any other room as long as it can't be damaged by humidity. She suggests soft lamplight rather than prepackaged overheads can look great.