Sonata

залезь в /usr/share/sonata (или как-то так) и замени значок на png

а нэту...

$ cd /usr/share/sonata/
bash: cd: /usr/share/sonata/: No such file or directory

поиск тож ниче особенного не выдал, есть несколько имейджов в 
/usr/share/pixmaps/ но они все png и все прозрачные.

rpm -ql sonata (или какой вы там пакетный менеджер используете)

$ rpm -ql sonata
/usr/bin/sonata
/usr/lib/python2.4/site-packages/mmkeys.so
/usr/lib/python2.4/site-packages/mpdclient3.py
/usr/lib/python2.4/site-packages/mpdclient3.pyc
/usr/lib/python2.4/site-packages/mpdclient3.pyo
/usr/lib/python2.4/site-packages/sonata.py
/usr/lib/python2.4/site-packages/sonata.pyc
/usr/lib/python2.4/site-packages/sonata.pyo
/usr/share/applications/fedora-sonata.desktop
/usr/share/doc/sonata-1.0.1
/usr/share/doc/sonata-1.0.1/CHANGELOG
/usr/share/doc/sonata-1.0.1/COPYING
/usr/share/doc/sonata-1.0.1/README
/usr/share/doc/sonata-1.0.1/TODO
/usr/share/doc/sonata-1.0.1/TRANSLATORS
/usr/share/locale/de/LC_MESSAGES/sonata.mo
/usr/share/locale/fr/LC_MESSAGES/sonata.mo
/usr/share/locale/pl/LC_MESSAGES/sonata.mo
/usr/share/locale/ru/LC_MESSAGES/sonata.mo
/usr/share/locale/uk/LC_MESSAGES/sonata.mo
/usr/share/pixmaps/sonata-album.png
/usr/share/pixmaps/sonata-artist.png
/usr/share/pixmaps/sonata.png
/usr/share/pixmaps/sonata_large.png
/usr/share/pixmaps/sonatacd.png
/usr/share/pixmaps/sonatacd_large.png