[fiiv]

Whoa, I hadn't thought of a sprite sheet, but that's a great idea actually. It shouldn't be too hard to generate one of these. How many favicons in one sheet are you thinking?

[Leftium]

I don't know... but a lot!

I have 1500+ bookmarks: https://instant.leftium.com/

And here's what my bkmks.com spritesheet looks like: https://i.imgur.com/dgoBEC4.png