Consider having a daybed in your guest room. That way the space can offer seating when a visitor isn't sleeping there. Built-in shelves by the daybed give your guests somewhere to set their personal belongings, such as an alarm clock.
"We wanted a bright, cheery room that said little boy," designer Miles Redd says of a kid's room in a New York City apartment. He paired the existing carpet with hand-painted faux-bois walls by Hurtado. "The red outline lends graphic edge.