Yes~ You should do the class!
There's so many combination of herbs & spices that work great in vinegars.
Sage, Tarragon, Parsley, Cilantro, Chives, Chili Peppers, Peppercorns, Garlic cloves...just about anything!
When I make the vinegars at home I never bother to heat up the vinegar either. The most important thing is to sterilize the glass jars.
Handmade Vinegars make beautiful gifts. Just cover the cap with homespun or cheesecloth, tie some raffia and attach an "Herbal" tag and your sure to impress!!
Now you have to offer the class & we want to see pictures~