There have always been tales of blue people in mythology, popular fiction, and in the news. Yes, blue people exist here and there in the real world.
Methemoglobinemia can be acquired through use of certain drugs, or can be inherited through the presence of recessive genes. There have been reports of blue families or tribes through history that could be explained by inherited Methemoglobinemia. The best-documented of these is the Blue Fugates of Kentucky.
Montana Libertarian Stan Jones was an unsuccessful candidate for the US Senate in 2002 and in 2006. He is also a victim of argyria. Jones began using colloidal silver he made himself in anticipation of antibiotic shortages predicted from the Y2K scare. He continues to take colloidal silver and believes in its health benefits.