Catching up to this late, but I really like the stained glass design, too, although the frosted also looks good. The thing I'd recommend on both is to simply reduce the transparency to whatever it takes to get the right look. It might be 16% or maybe 35% or even 78% -- that's going to vary with the actual material, the lighting, and your ideal. Also, when working with glass, set the dark fade-out color to black and the light fade-out to white. If you have some specialty glass, something else might work better, but I've found that black and white really make a huge difference in helping the glass look like glass. The other recommendation I'd add is along the lines of what Beck suggested, and that is to focus first at the basic appearance of the glass you want -- ignoring the ideas about glass. In other words, ignore transparency, ignore reflection, highlight, etc. Go for the color and the visual texture -- the way it looks like it would feel if you could touch it. Once you've got those points looking right, then move also to transparency. Leave reflection to last, because it usually doesn't take much if any on a good glass. Also -- wow, nice model! :D