Each icon has been designed to have a recessed look in the normal state, while on rollover state the icon gets a white glow. This set only contains the 5 icons shown here, but since the effect has been acheived using photoshop’s layer styles, you can simply add your own icons, copy the existing styles, and you’re done!
This freebie may be used for both personal and commercial projects. Attribution would be appreciated, but is not required. For further details see the licencing page.