I'm not a pro.... but you can try this:
- Try using a light tent with 2 or 3 light sources, 1 on eatch side + 1 on top...
- Try using a light tent with 2 or 3 light sources and put some coloring gel on 1 or all of the light's to play with color's...
- Try to take this shot with some liquid in the glass, use those coloring liquid thingies that normaly are used to color food (sorry, don't know the correct name for that) and play with the colors...
- Try to put the glass in the freezer for 10 or 15 minutes and then drop some room temperature water insede it, it will make the glass moist and if you get the shoot while droping the water you should get a verry cool shot...
- Try and put a CD under the glass, with the correct light it should make some cool color reflections...
Just my 2 cents....
P.S.: for the light tent, i got a look alike in the super-market that was made to put dirty loundry inside... work's like a charm!!! And it was only $6 US.