If you're looking for interesting fugue material for teaching, consider
Glenn Gould's little "cantata", "So you want to write a fugue" which
appeared on one of his last releases.  Great fun.  And Peter Schickele
wrote a cute one in his "Toot Suite" for calliope organ.  If that doesn't
get a chuckle from your students, nothing will.

Good luck in your hunting.

Eric Kisch