Flowers of Sunday outing

Last Sunday we went to the Japanese garden. Hardly had we entered when a sudden storm blew up, wringing itself out after about 20 minutes. We were sheltered by the awning of the entrance to the Garden, along with a motley group of individuals. Afterwards, I took pictures of the flowers and flowing water in a brook, swollen after the rain.
These are the flowers, of a most interesting type.
Some lightly-fragrant flowers
After the rain
Blue flower
So what color is that?
The hoi polloi of flowers