See the Pen Material Design Spinner by Fran Pérez (@mrrocks) on CodePen.
See the Pen Loader #5 - Hourglass by Fabrizio Bianchi (@fbrz) on CodePen.
pretty nice collection here at Designer News.
This could take a while
See the Pen tFJiB by Luke Richardville (@lukerichardville) on CodePen.
pure CSS loading animations with minimal effort! simply manipulate class names on existing elements.