NMAP.org took the favicons of the top 1,000,000 sites on the web and threw them into a single collage, with each favicon sized to represent their overall popularity,
We retrieved each site’s icon by first parsing the HTML for a link tag and then falling back to /favicon.ico if that failed. 328,427 unique icons were collected, of which 288,945 were proper images. The remaining 39,482 were error strings and other non-image files. Our original goal was just to improve our http-favicon.nse script, but we had enough fun browsing so many icons that we used them to create the visualization below.
Gearfuse.com is indeed on there if you feel like hunting. Or you can cheat and just use the site’s search option. The largest icon by quite a healthy margin is Google, measuring 11,936 x 11,936 pixels, compared to Gearfuse’s 40 x 40. What a buzz kill.