(this project initially debuted on my blog on August 31, 2011.
I love going to thrift stores to shop for vintage silver trays (some of them may be silver plate, some are probably just silver colored). I get them home, clean them one more time, prep the inside surface with a primer coat and then I've added a chalkboard surface to the middle of the trays (some are round, some are oval, a few are rectangular) and then punched the ends for a hanging ribbon (I love my crop-o-dile!). I typically use three layers of chalkboard paint to get a good layer. And remember to "prime" your chalkboard surface once its ready - just run your chalk over the top of it.
I've got Chalkboard spray paint from Krylon and the chalkboard acrylic paint from Martha Steward and I really like both of them.