In decorating glass spoon pipes, sandblasting is a wonderfully popular technique, with few substitutes. While hand-etching is possible, it is incredibly time consuming and expensive, and laser-etching has a range of flaws which make it a questionable choice. There are two main ways in which sandblasting is used to decorate glass: etching and carving.
In glass etching, abrasive is blasted at the glass lightly to turn the glass semi-opaque. This 'whiting' or 'snowing' of the glass can be used to great effect to produce words or images. By adjusting the speed of the sandblasting and the angle from which the abrasive is being launched, differing shades can be created, allowing for some true works of art. Glass is carved by steadily sandblasting the surface through a stencil which protects the areas you don't want to be carved out. Sandblasting as a technique for carving can be very nuanced, with differing depths and angles of cuts creating an array of lighting effects that may be quite beautiful.