The Invisible Pony..

Ok, so I've started on my next new custom MLP.. the invisible pony! I've been giving this alot of thought.. I mean what material, other than glass can you use, that will be able to set hard and be transparent? Ideas so far:
-ice (but too melty..)
-those bead things that you melt with the iron, you can get clear ones of those
-cling film and PVA glue
-glue gun glue
-a mosaic of small squares of transparent plastic from blister packaging (thanks Gemma!)
-Mum suggested that stuff you used to get in kits for making paperweights with flowers in and stuff.. it starts off as a liquid but then sets hard and clear! sounds hopeful.. don't know if they still sell those kits tho!? Will have to keep an eye out.. tell me if you see one!!
-don't make it invisible at all, just give it a suit and a bandaged head with sunglasses on top

Any more ideas?

At the moment I'm in the process of making a MLP mould out of clay, and then using that, I plan to try out some of these to see which works the best!