I stumbled across this image by Hugo Dechesne and liked the sense of depth suggested by the stacked tiles. Click on his image to see a higher resolution version.
I've tried to recreate the technique and applied it to a more famous image. The second version below just uses smaller tiles. I'm pretty happy with how it came out for such a simple technique but I still prefer the shading in Hugo's images. I think he's using a more diffuse and rounded shadow.