Have you heard about Krystal Kraft Acrylic? Krystal Kraft are clear acrylic pieces are great to use in your jewelry work. They are laser cut to smooth the edges and come in a variety of shapes. One side is pre-treated to accept a variety of inks or coloring mediums. It looks like frosted glass, but once it is inked/stamped/marker colored/glittered/glued on etc… it becomes clear.
I found this fantastic tutorial on using Krystal Kraft acrylic shapes. I love what they did with the glitter backgrounds.