Hmm, this has probably been thought of already, but a tile_texture
keyword might be nice. It would repeat the texture in the cube from
<0,0,0> to <1,1,1> through space, flipping every other one around to
make a nice tiling pattern.(not smoothly tiling, but it would make a
nice effect with some textures.) Also a tile_texture2 which would use
different squares for each tile or tile group, so the exact same thing
doesn't repeat every time. I know it is possible to do this with the
current version, but having a keyword to do it would be nice and
probably faster rendering.
Also, allow the box to be defined.

texture {SandStone
    tile_texture2
}
or:
texture {SandStone
    tile_texture < 0, 0, 0>, < 1, 2, 2>
}

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