Path to themes

Hi everyone

I want to better organize themes in my WP installation.
Can I somehow make WP look for themes not only in wp-content/themes, but in subfolders as well?
For example:
wp-content/themes/themeset-1/…
wp-content/themes/themeset-2/…
wp-content/themes/themeset-3/…

And I wanted my WP backend display a list of those subfolders first, and when clicked – display themes in this subfolder as usual.

Another idea was to create a tag cloud, cause I noticed that some themes in WP2.6 are ‘tagged’ but my present PHP skills won’t let me program such a tag cloud…

Maybe someone can offer some workaround?

Mike