The Eagle (2011)

[Lallans]

there really are blue people not just painted blue

http://www.straightdope.com/columns/...of-blue-people

wikopedia says so
http://en.wikipedia.org/wiki/Methemoglobinemia
so it must be true

Interesting! Of course the original Britons, the ones in posssession when the Romans invaded, dyed themselves blue using wode, as alluded to in the OP. Or at least that is supposedly where the name "Briton" comes from. If the Picts were a separate tribal culture, it would be surprising if they did the same.