I made a couple sets of these for Christmas gifts and they were a big hit. Such a big hit that I've purchased a large roll of chalkboard vinyl and will be making up sets to sell. As you can see, they worked great on these IKEA Burken jars.
Please stay tuned, these should be available in a couple weeks. Set of 12 - 2"x3" labels - $5.00. Other sizes and shapes to follow!