I have been painting Christmas ornaments (using enamel paints) for weeks now. The first set were wild birds (one is pictured above and another below) that I sold at a local art show, and also have for sale at a local store (Wild Birds Unlimited).
For those who would like to make their own: the paints I use are FolkArt enamel, which is permanent, reasonably priced, and works on glass and any other surface. I have been getting orders from people who have seen these; and also commissions to paint pet portraits (cats).
I love making these; it makes for a unique tree topper!