I spotted this damselfly resting on a tulip stalk today, perhaps associated with the neighbour's pond. Not being familiar with the varieties on offer, it took a little while to identify, but I think that it is a female Common blue damselfly, based on this description, the most important excerpt being: "the female is blue, brown or olive-green with extensive black markings including a Christmas tree or double arrowhead on the eighth segment." I'd say this is olive-green/brown with a Christmas tree marking matching the diagram on that reference page. They're also common as muck and about at this time of year, which makes it pretty likely.