License: Free for Commercial Use
The following is a PSD file that contains 8 swatches with 8 differently modified Layer Styles, meant to represent a variety of smooth Glass surfaces. These should be great for almost any of your needs. Some adjustments may need to be made on different styles for larger shapes than presented above.
All are transparent, though the levels of transparency differ from swatch to swatch.
I like the ideas of hands-on learning, which is why I’ve given you these Styles in this PSD format. Feel free to save them to your Styles Pallet as you see fit… or modify them to better suit your purpose.