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The Cavity Mask can be used with any two materials. Note that it is intended for sculpting only, it has some limitations. The object must be centered in the viewport (NumPad point Key) or near for the normals to work properly.
Download the material:
4shared.com/file/72649516/64c2c68d/GLSL_sculpting_materials.html
BlenderArtists thread:
blenderartists.org/forum/showthread.php?t=134192