Looks a bit like Epilobium (Rosebay Willow Herb) or something similar (how tall is it?). Makes for a nice abstract photo though and the dark background works well.
When I saw the photo, I instantly thought it would be an Epilobium, yes, so I think Pete is right. Sometimes you find dwarf forms of it, especially on nutrient poor places. It's a close relative of the famous fireweed, which is placed in Epilobium by some systematists too.