Here's a mosaic of one of HPC's latest chips (using his regular business card chips as the cell pictures):
The fullsize mosaic (4278 x 4320 pixels, full bit depth) 21.6 MB is available
here.
Note: These mosaics are designed to be printed out on a large format printer, and viewed from both a distance (to see the overall design), as well as from close-up (to see the individual chips that make up the cells). They don't work so well on the limited resolution of computer monitors, but you can zoom in on the image to see what's going on.