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