Location for user installed plugin libraries and icons

[Jon Gough]

Hi List,
   I am working on a user driven plugin management process for an 
application which is installed via a 'deb' file. The application is 
installed using 'root' privileges, but the plugins need to be 
installable by the user without root privileges. The plugins will 
consist of libs, icons, etc. that are used to 'run' the plugin and user 
updateable config files used to 'control' the plugin.

   If the plugin was installed by a 'deb' file it would put libs and 
supplied icons in a system area, i.e. /usr or /usr/local, and the 
updateable config files in a user writeable area, i.e. 
$HOME/.<application>/. What would be a suitable location for the libs, 
icons, etc. for the user installed plugin?

Many thanks
Jon