Little Big Details

Medium – When editing the favicon is the outlined version of the logo.

Trello - Favicon reflects the current board background color, even for custom uploaded backgrounds.

/via puts rand

Mixcloud - The favicon displays if a mix is playing or paused, as well as the progress of the mix.

GitHub System Status – Favicon changes color depending on current system status.

/ via losstopschade

YouTube - The favicon changes based on whether the video is buffering, playing, or paused.

/via tmercswims

Gmail - Incompatible versions of Internet Explorer show a damaged envelope as the favicon.

/via Eric Hansz

Apple - The favicon was at half mast during the anniversary of Steve Jobs’ death.

/via ceenk

Colllor - The favicon changes to match the chosen color

/via Tom

Flickr - The favicon turns into a live indicator showing the progress of the upload.

/via nWODT_Cobalt

Mixcloud - The favicon indicates whether the music is playing or paused.

/via Victor A. Leão