Michelle Hi Louise,
Both colors are custom made. The dark navy blue, a Sherwin-Williams Duration is a gloss exterior acrylic paint. The light blue, an exterior Sherwin-Williams Latex coating: Woodscape waterborne advanced formula, flat. Hope this will help and thank you for your nice comment
Michelle

Shawn Lagemann There are many different species of hydrangea, some bloom from old wood, some bloom from new wood. The old wood species are pruned after bloom and the new wood can be pruned anytime. These look like Nikko Blue which would be new wood. There are many websites that can help you identify your species and help you with feeding as well as pruning.

virginial I cut these down every year and they bloom on the new wood. I cut them down to about 5 inches from the ground about a month ago and they are already getting flowers on the new stems. Each hydrangea is different...look up directions for them and how to keep them blue.

Michelle In France, and maybe in Europe, they are called "hortensias"

Love Landscapes and Design I'm not sure if they are exactly this species but 'Nikko Blue' is very similar.