I have a nice extension in Windows, called MP3Ext, which is an extension for the Windows Explorer. You can have a look here:
http://www.mutschler.de/mp3ext/
The feature I like is a Icon Handler, which makes new icons for MP3-files. Based on their bitrate, you can see different icons.
I wonder if there is such a tool in Linux or if it is possible to do it using native KDE or Linux features.