With Material Vector Icon it's easy to use Google's Material Icons in your Unity project!
Just add the MaterialVectorIcon UI component to your canvas, choose an icon, change the color and that's it!
The advantage of using vector icons is that they can be scaled to whatever size you want without losing the quality
Update 1.0.1– fixed visual bug in editor (thanks to amisner2k)
Update 1.0.2– pick icons in an external window for better usability–now supports multi-object editing
Documentation | Video