0verence 9 years ago I heard they make the walk-able tunnels in aquariums with plexi-glass. Or you could replace a scratched glass of a wrist watch. Or you could laser etch a landmark inside of it. Hey, if asking such an open question, at least give a little bit of information. - How big, how thick is your piece, is it clear, frosted, tinted, scratched or mint? - Do you have access to special tools (power tools, laser cutter, heat chamber...)? - What's your skill level?