ic_launcher
idea from http://www.rgbstock.com/bigphoto/meMHCk0/Smiley+Box
ic_action_select_all
and ic_action_select_invert
icons from:
- http://google.github.io/material-design-icons/ (sources: https://github.com/google/material-design-icons)
More can be found at http://materialdesignicons.com/.