11.04 - Where are GTK+ icons stored? - Ask Ubuntu
askubuntu.com › questions › 153619The theme, for one. If you change the icon to be something else, and it isn't consistent with the rest of the theme, for example. And if you change it to "fit" the design of an app you're trying to write, it will break other applications that are different from your design. And if there's an update to the theme, you will lose the changes. –