I had a lot of fun giving the mug rug class at my local library, Purcellville Library in Loudoun County. We got some of the fabric we used for the class at Web Fabrics. They sell quilting supplies, among other things sewing related. A lot of their business is online, hence the "web" part of the name.
They also sell pre-cut kits to make wine coasters. These are similar to the mug rugs I have been making, as they are made with fabric and batting. They aren't quilted so they are very quick to make.
The library is planning on buying some kits to use for a future class.
Web Fabrics has even made a YouTube video demonstrating how to make them. The fabric is woven in such a way as to allow you to place the base of a wine glass inside. This means it can serve as a coaster and as a wine glass identifier, like wine glass charms.
I decided to make a coaster using their instructions and my fabric so I would know if I could teach a wine coaster class at the library.
In short, this is how you do it. Cut six 5 inch square pieces of fabric. One can be fabric you don't particularly like as it won't be seen. Try to make the others fun and interesting.
Cut one 4 1/2 inch square of batting. Fold 4 of the squares in half and then press.
Place the boring fabric down first. The batting goes on top and the unfolded square on top of that, right side up. This will be the back of the coaster.
Put two of the folded squares on top with the raw edges facing out. Weave the other two squares in, also with the raw edges out.
Sew around the coaster. Clip the corners and turn the square inside out.
Use a chop stick or something similar to poke the corners out and press.
Bring on the WINE!