fleetingly blue...and red....and green...
On a metal rod in a potted plant outside, we have a little solar light that flashes 3 different colors all night long. It came with an assortment of clear plastic tops that sit on top of the light and glow from inside. We put this hummingbird one on first and have never changed it. It was a gift from my Mom and it's one of those small things that ends up being such a part of your everyday life. We can even see it from our bedroom when we go to sleep.