Flutter Material Gallery
Demo app for the Material Design widgets implemented in Flutter.
Icon
Icon was generated using Android Asset Studio: https://romannurik.github.io/AndroidAssetStudio/icons-launcher.html#foreground.type=image&foreground.space.trim=0&foreground.space.pad=0.1&foreColor=607d8b%2C0&crop=0&backgroundShape=square&backColor=ffffff%2C100&effects=none
From the Flutter Logo: https://github.com/flutter/flutter.github.io/blob/master/_includes/logo.html which appears to be CC-BY 4.0.