Well, for that, you could use onion or wood pattern. And perhaps a
spherical or cylinderical pigment_map to limit those patterns, or you
could just use multiple objects, or you could use a disk object...
The only place I think a torus pattern could be useful is in media. But
it would be extremely useful there. (flourescent bulbs, dust rings from
a shock wave, etc...)
BTW, doesn't the Superpatch already have a toroidal pattern? Of course,
with the Superpatch, you can make any pattern with the isosurface
functions used as patterns.

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