Clever ways to make folders for iTunes playlists, or otherwise organize/divide them?

I’m a musician and I have a LOT of playlists in my iTunes, one for each album plus many other miscellaneous projects. I would LOVE, no really I mean LLLLOOOOVVVVEEEE, to be able to arrange them other ways besides alphabetically. I want to put related playlists in a macro-folder, grouping by genre (or my own stuff, or mixes for/from others, etc). [If you’re thinking it, no, I don’t want to change the ‘genre’ entry on each song and sort and navigate in the Library]

I have looked around online and see that iTunes doesn’t have this function – but I’m wondering if others have come up with clever ways of doing this within iTunes, or if there are programs others have made than can be downloaded to adjust how you use iTunes (like iPhoto Buddy for iPhoto, or widgets or plug-ins or whatever all these things are called).

Thanks!