warning_icon.svg
- from http://commons.wikimedia.org/wiki/File:Warning_icon.svg
- by http://commons.wikimedia.org/wiki/User:Amada44
- license: public domain

open.png
- from http://tango.freedesktop.org/Tango_Desktop_Project
- license: public domain
- color modified by Kambi (using GIMP)

walk.svg based on
- http://www.openclipart.org/people/ryanlerch/ryanlerch_No_entry_sign_with_a_man.svg
- by ryanlerch
- license: public domain
- modified heavily by Kambi (who takes responsibility for all the ugliness
  caused by his editing :) (using Inkscape)

examine.svg based on
- http://commons.wikimedia.org/wiki/File:Necker_cube.svg
- license: Creative Commons Attribution-Share Alike / GNU FDL >= 1.2
- modified by Kambi (using Inkscape)

fly.svg
- from http://commons.wikimedia.org/wiki/File:Falco-peregrinus-silhouette.svg
- license: Creative Commons Attribution-Share Alike / GNU FDL >= 1.2
