It would probably be rather itchy. Agustina Woodgate, in her "I Wanted to Be a Princess" series really took the Rapunzel story and ran with it. This first work, called "Tower," uses 3,000 bricks made out of human hair.
The second, called "Sandcastle," looks like... well, a sandcastle. Made of hair. Striking, if really really strange. From whence all this hair came I dare not ask. [Inhabitat]