if you'd like to decorate plain dishes with pen i recommend using pebeo porcelaine paint pens, after you've finished your work place the piece in room temp over and let it warm up with the oven, bake 30 min on max. temperature. painted and baked pieces are dishwasher safe!
Ring-A-Lings: These pretty baubles have the look of glass enamel but are easily created by painting a metal washer with nail polish. Start with a base coat of white or yellow. Add colors, letting each coat dry before painting on top of it. Top the finished design with a protective coat of clear polish.