Thread:Extension talk:Echo/Skinning Echo?/reply (2)

There's no guide for skinning Echo, it has only been designed to work with the default core skins AFAIK.

If you want to try and skin it, you can just create the JS/CSS files you need, and add the 'skinScripts' & 'skinStyles' parameters in $wgResourceModules: use the 'ext.echo.overlay' module for the flyout, and 'ext.echo.badge' for the badge.