I found the glass paints and vases at Michael's craft store.
The students practised on paper first. Ideally, I would have liked to have them study spring flowers and create still life drawings, but due to time, we practised some designs on paper with curved lines and various dot flowers.
I coated each design with a clear glaze for extra protection.
and best of all, it's a treaure to save, made with such care and love.