You don't want to space icons out with little generic Windows executable icons after all, you want to space them out with nice transparent open space. We've created a 256x256 transparent icon for you.

“The transparent wood is lighter and stronger than glass. It could be used for load-bearing windows and roofs,” says Hu. “It can be potentially used to make a see-through house.” ...

Chrome 52 for Mac introduces Material Design w/ new icons & flatter, transparent interface. ... Other Material changes include new icons, tab shapes, and omnibox design to match mobile Chrome.