I always thought it was to mimic the sky-
but then in the past few years have been told that there is a
ward off evil/moorish/spanish/ new mexico component to blue shutters
& window trim.
DD
--
We have enough laws on the book, already, to confound us well into the
21st Century.
What we lack is enough L.A.W.S. for the next century &
One of those spiral cut hams and a real bow tie for the Millennium
celebration.