Gesture Layer 2 (all the icons in data/elementary/images/g_layer):
  Illustrations provided by GestureWorks® (www.gestureworks.com)
  Creative Commons Attribution Sharealike license v 3.0.
  http://gestureworks.com/
  http://gestureworks.com/icons-fonts
  http://creativecommons.org/licenses/by-sa/3.0/us/

EFL Bluish-X icons theme (all the icons in data/elementary/themes/fdo):
  GNU General Public License v3
  see the README in data/elementary/themes/fdo for more info