Berry bees, Osmia aglaia, amaze me because they appear brilliant blue or green depending on the light. Sometimes, they reflect both at once.
Since they are called berry bees, I used to think they were specialist bees, but they are not. This year I have seen them on just about everything in my garden including clover, lavender, salvia, phacelia, nepeta, blackberries, sneezeweed, and hawksbeard. They are small and quick, darting from flower to flower almost faster than you can see.
Like other Osmia bees, they readily nest in tubes, especially small ones a quarter inch or less in diameter. These bees are native to western Washington, Oregon, and California and are sometimes raised to pollinate berry crops.
I never get tired of watching them sparkle in the sun, first green, then blue, but always spectacular.