I don't know of a way to edit the first picture. But the second one can be customized by using TweakUI. TweakUI can be found here -
http://www.microsoft.com/windowsxp/d...powertoys.mspx
In TweakUI select common dialogs, then places bar.
The icons for the other places can also be customized, it's in some dll file, probably shell32.dll