Inspired by an Gimp Tutorial to create an engraved Text on a Banner, i build a new Filtereffect for Inkscape yesterday:

Another example:

It contains three basic Sizes. The objects/Shapes or Text should have a black Fill /Alpha 240.
I found out that an white Fill looks like Glas.
Have fun with it!

Download from OCAL:
http://openclipart.org/people/Chrisdesign/Chrisdesign_Gravure_Glas_Filtereffect.svg