Tanypterix, what I find where I live, I get lots of dragonflies with the back parts of their bodies being blue flying around the fish pond. I used to think that they were something like big mosquitos.
It's basically a swimming pool where I don't use chemicals while growing my kois because they are beautiful, too.
Artificial waterfall and all that also involved.
All those dragonflies I've seen have got deep blue backsides (or whatever you call those back segments).
Thanks for what you do here. I look at those dragonflies in a new light. And I look at what they do! They're beautiful.