Once again, one of Google's own apps offers some of the best Material Design you can get. The recently released Messenger app is a straight-forward SMS and MMS app that uses Google's new design directives to the fullest. It's fast, clean, and fun to use, even customizing each conversation with a different color. I'd love to see Google add actionable notifications and iron out some of the MMS wrinkles a lot of users are seeing in it, but as far as design goes, Messenger can't be beat. You can download Messenger for free from the Google Play Store now.