The one-way streets fronted by white stone buildings contribute to this look, and of course for the Christmas season each neighborhood hangs lights and decorations. (I think this is to give some visual variety for the winter season, in lieu of snow which almost never happens.)
But then... the skyline is occasionally broken by what I can only describe as a visual non sequitur.
This post's theme word is vegete, "lively, active, vigorous." The vegete holiday decorations may have gone too far.