You can add more crystals while the surface is hot and sticky and keep building up the surface and adding colour or small objects to it which will eventually cool and set into it with a smooth transparent surface like glass or plastic, but slightly waxy to the touch.
I used it to make a series of small alphabet tiles (3x5cms) using stamped images underneath, objects embedded and the alphabet letter stamped into the surface of some just before it set.
Here are the results:
And a close up
There are lots of UTEE ideas online so check it out if you think you night fancy a go... or just like to browse the crafty world.