Conwentzia psociformis - Backlight
Luckily this little Dustywing was sitting fairly still for a while, so I had a chance at taking this image with a long exposure and natural backlight (as opposed to the flashed image below). The backlight through the wings brings out the wing venation quite well and also even shows up a shadow/contour of the much smaller hind wing, typical for Contwentzia spp.
Here is the same scene while using a flash:
Conwentzia psociformis is a species of "Dustywing" (Coniopterygidae) living on broad leaved trees and shrubs in large parts of western Europe.