http://www.gentleface.com/free_icon_set.html
The Creative Commons Attribution-NonCommercial -- FREE
http://creativecommons.org/licenses/by-nc-nd/3.0/

Sound:
http://www.freesound.org/samplesViewSingle.php?id=2166
http://creativecommons.org/licenses/sampling+/1.0/

placed.png, received.png, placed.png
Free for commercial use
http://www.iconeden.com/icon/free/get/bright-free-stock-iconset