In the U.S., public toilets are called restrooms. I guess that the term was adopted as a sort of euphemism for activities we do in toilets. Certainly nobody goes there to rest.
The stereotypical ideal of an airport toilet is to be clean, bright, and spacious (hopefully). It is probably the last place where you would expect to see innovation. Yet, the interior designers of Minneapolis Airport took a different route: Instead of delivering another cliché, they played with colours and light. The outcome is a calm yet vivid design. A restroom indeed.