Thanks!

I'm thinking about adding some of the Google web fonts.

Also, there's a neat technique to make the text color either black or white depending on what has more contrast against the background color.

https://24ways.org/2010/calculating-color-contrast

Nice! I'm definitely going to use this. The text is barely visible on a lot of the lighter colors right now.

What is this magic?

I didn't check the source, but rendering the <canvas> to a data URL, and using something like this [0] would work.

[0]: http://stackoverflow.com/questions/5199902/isnt-it-silly-tha...

Yep, this is the strategy that I'm using. I export the canvas to data URL and place the data URL in the href attribute of the favicon <link>. I'm not sure if this works in every browser though.