customizing gnome icons on task bars

[H. S.]

Given Debian Unstable, can I customize the the appearance of the icons 
that appear on the task bar using the 'add applet' (or something 
similar) option by right clicking on taskbar?

I am trying to change the icons (or the pop-up labels) of the volume 
controls. I have a control for PCM, speaker and headphones. All appear 
to be the same. Even the pop up messages that appear when I place the 
mouse over the speaker icons say "Volume Control". I would like to 
modify either the icons or the labels or both. Suggestions?

thanks,
->HS

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