Did you ever struggle with to many themes in your WordPress installation? I had enough of the messy theme page on WordPress Backend. As developer I need sometimes a ranking for themes. So I decided, there have to be a way to label themes or assign a category in this case a folder to them.
That is why I was writing a code to folder WordPress themes.
Load different groups of themes into the wp-content. Go to the Admin Page under Appearance -> Theme Folders and give the names of the different folders. Now you have folder view of different theme groups.
Then you can preview themes from certain categories or delete them.