White Northern Lights, Lapland, Finland, Space via Ben Rogers
"Multicolor Aurora Borealis -Beautiful" northern lights also has the rainbow flavor.
Travel Tips :: When and where to see the Northern Lights :: Infographic of the Northern Lights: how they occur, where and when to see them.
5 More Things No One Ever Tells You About the Northern Lights - Luxe Adventure Traveler. This has great information about the Northern Lights.