Crystal icon theme
    Conectiva Crystal Icon Theme Beta 3.7
    https://launchpad.net/ubuntu/hardy/i386/kde-icons-crystal/3.7-2
    https://commons.wikimedia.org/wiki/Crystal_Clear
        LGPL

nuvola icon theme
    LGPL v2.1
    see icons-kde3/nuvola/readme.txt

vym icons
    http://packages.ubuntu.com/trusty/vym
    http://changelogs.ubuntu.com/changelogs/pool/universe/v/vym/vym_2.5.0-2/copyright
    GPL-1+
