Interesting. I would also guess Venetian Blinds. Also, perhaps crop off some of the bottom -- the top is very interesting, but below it seems to be a bit dusty, and doesn't really add anything.
I thought the same thing about cropping the bottom. I just didnt know how much to cut off without taking the effect of the photo away. And yes, Venitian (sp) blinds. Taken with Nikon 28-80mm
EXIF:f/3.3-5.6 lens at 70mm F/5.6 ISO200 1/200s Shot in manual.