Notes about the images:
 * icon_00
   - Liftarn
   - GNU Free Documentation License, Version 1.2 or any later version
     published by the Free Software Foundation;
   - http://commons.wikimedia.org/wiki/File:Littlebluedog.svg
 * icon_01
   - David Vignoni
   - GNU Lesser General Public License as published by the Free Software
     Foundation; either version 2.1 of the License, or (at your option)
     any later version.
   - http://commons.wikimedia.org/wiki/File:Nuvola_apps_package_toys.png
 * icon_02
   - Nicolas Rougier
   - GNU General Public License as published by the Free Software Foundation;
     either version 2 of the License, or any later version.
   - http://commons.wikimedia.org/wiki/File:BabyGnuAlpha.png
 * icon_03
   - Frédéric Bellaiche
   - GNU General Public License as published by the Free Software Foundation;
     either version 2 of the License, or any later version.
   - http://commons.wikimedia.org/wiki/File:Bear.svg
 * icon_04
   - public domain
   - http://commons.wikimedia.org/wiki/File:Dog.svg
 * icon_05
   - public domain
   - http://commons.wikimedia.org/wiki/File:Cat_silhouette.svg
 * icon_06
   - Fumiaki Shingu
   - GNU Free Documentation License, Version 1.2 or any later version
     published by the Free Software Foundation
   - http://commons.wikimedia.org/wiki/File:Bitti.png
 * icon_07
   - The people from the Tango! project
   - public domain
   - http://commons.wikimedia.org/wiki/File:Input-mouse.svg

from icon_08 to icon_31:
  stolen from elementary/data/images
  don't know about licences, authors

 * mobile_icon_00
   - Atif Gulzar
   - Royalty Free
   - http://www.sxc.hu/photo/907992
 * mobile_icon_01
   - Sias van Schalkwyk
   - Royalty Free
   - http://www.sxc.hu/photo/1131912
 * mobile_icon_02
   - Sias van Schalkwyk
   - Royalty Free
   - http://www.sxc.hu/photo/1376160
 * mobile_icon_03
   - Lee Adcock
   - Royalty Free
   - http://www.sxc.hu/photo/358722
 * mobile_icon_04
   - Mike Smith
   - public domain
   - http://www.sxc.hu/photo/964562
 * mobile_icon_05
   - Fernando Weberich
   - public domain
   - http://www.sxc.hu/photo/773566
 * mobile_icon_06
   - Sias van Schalkwyk
   - Royalty Free
   - http://www.sxc.hu/photo/1304496
 * mobile_icon_07
   - artur022
   - Royalty Free
   - http://www.sxc.hu/photo/1389359
 * cards
   - Kriss Szkurlatowski
   - Royalty Free
   - http://www.sxc.hu/photo/1169466