I was thinking of something like this the other day. but after some time contemplating on how hard it would be to cut, grind, or chisel real stone I found out my boss throws out grip sized pieces of corian every once in a wile, and that stuff would be way easier to work with.
so I guess if you want the look of stone go with something like corian.
but if you really want stone it is possible but costly......if I were you I would sell the marble window sills (if they're in good shape) to a antique store, they're probably worth more than it would cost to make a pair of grips.
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<< "I'm not an atheist, and I don't think I can call my self a pantheist. We are in the position of a little child entering a huge library filled with books in many languages. The child knows someone must have written those books. It does not know how. It does not understand the languages in which they are written. The child dimly suspects a mysterious order in the arrangement of the books but doesn't know what it is. That , it seems to me, is the attitude of even the most intelligent human being toward God. We see the universe marvelously arranged and obeying certain laws but only dimly understand these laws. Our limited minds grasp the mysterious force that moves the constellations.