There are several species that are exotic for a northern European guy, but one species is just so different in shape, from what I normally see, and the colours of the male is awesome. It's a damselfly, but with a very unusual body shape, not with the normal thin abdomens most species have.

Platycypha caligata (Dancing Jewel), male.
13/12 2006, Nwanedzi River, Limpopo, South Africa.
5D, sigma 150+1,4, slightly cropped to 3600 pixels width.
Erland