My first attempt with the *Nestalgica's Rectangle and Curl Tutorial -> [link]
It took me like 8 hours to render 1600x1200 image!!! I had to zoom in order to get more detailed and clear image! Most probably I'm missing a step or something... Anyway, I hope you like this, and oh yes please visit his gallery, you'll find some wonderful pieces there!
Designed & Rendered in: Apophysis 2.05b2z+c++
Post-work: PS CS2