Ajax is producing several grips for the M-1911, made from a wide variety of materials, such as genuine stag, ivory polymer, white pearlite, black pearlite, exotic woods, rosewood, rubber and genuine ivory (please do not buy those last ones, think of the poor animals that had to be killed for them. Buy the ivory polymer instead, they look exactly the same).

Unfortunately, their site contains very few pictures of M-1911 pistols, featuring their grips. Here are the ones I found.