What clear hard plastic could be molded into decorative bottles that sparkle in the light as cut crystal does?

Here's a site with all kinds of bottles, jars, and accessories:

http://www.sunburstbottle.com/

Click on the small pictures to get a view of multiple bottles/jars in that category, such as: http://www.sunburstbottle.com/

This site has some unusual plastic bottles. Look at the closeups of #4 and #5 on this page:

http://www.labsafety.com/store/Lab_Supplies/Plasti...

Have you thought about using the empty bottles from bottled water? Just a thought.

You could get larger bottles and decorate them with tinsel and ribbon and all sorts of things. Like sparkling confetti and then get a smaller bottle and put it inside of it and then seal it with hot glue. I've never heard of moldable sparkling plastic unless you'd smash old CD's and then piece them together on solid glass bottles that could be refilled. Of course it would take forever. Using clear drying glue on glass bottles and then rolling them in glitter or confettl would probably work better. Good luck.

I would suggest just molding the plastic out of whatever you generally use and then putting a thin coat of a sealer with an aurora borealis finish. It will catch the light with different colors and mimic the crystal effect. Good luck!