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I don't know exactly where this fits best, so I just put it here, please move it if its inappropriate here.
How do I change the tray icon of an app? Is there an easy way to do that without editing source code?
Maybe a folder where apps often store their tray icons?
Or change the gtk/icon theme?
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It depends on what icon you want to change.
Some tray icons are taken from icon theme (example: Transmission), while other icons come from /usr/share/pixmaps (example: Pidgin) and few apps have their tray icons stored even somewhere else.
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