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I've been making these for a long time. One of my favorites is (x XOR y) MOD 3 != 0

((x ^ y) % 3) != 0

Other primes like 5 and 7 look interesting as well.

With ((x | y) % 7) != 0), I get this result in Processing: http://i.imgur.com/K35xxI7.png

I think I know what I'll do for the rest of the evening.