This script generates a hexagonal grid then fills the color from an underlying rasterized image. So you first place an image with in the artboard, and rasterize it. Then execute the script.

The blurry photo I used here is from Yunyunsarang Deviantart.

*** JAN 4 2012 *** IMPORTANT UPDATE ***
Upon seeing so many bug reports, I decided to write a more user friendly Grid Generator that focuses on the grid, nothing else. Hope this would resolve the issue and happy new year every one! :)