This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
This filter will create a variety of glass effects, mostly clear glass. You can make glass bricks, broken glass, cut glass and so on.
Future versions may include frosting and colored glass.
Craig Kraellin Walters glass menagerie frosted clear bricks refraction broken cut
This filter has earned its author one of our rewards. They are given to the authors of popular filters and include a free copy of Filter Forge.