you can do this by mixing Elmer's glue with food coloring and paint it on to any glass to make it look like seaglass when dry.
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.