1996 2006 WoW project by Aram Bartholl let people "play" as their World of Warcraft avatars in real life.
If your name is Leeroy Jenkins, you'd have to use big fonts ;)
The WoW project takes this mode of publicizing players’ names that’s typical of online 3D worlds and transfers it into the physical domain of everyday life. Participants of the WoW-workshop will be able to construct their own name out of cardboard and then parade around in public with it hovering above their head. What happens when a person’s customary anonymity in the public sphere is obliterated by the principles operative in virtual worlds online?