Algorithms don't have to be state of the art.
One of my favorites is a prime number generator based on a predator-prey models of cicadas: http://www.j-npcs.org/online/vol2000/v3no2/v3no2p208.pdf
One of my favorites is a prime number generator based on a predator-prey models of cicadas: http://www.j-npcs.org/online/vol2000/v3no2/v3no2p208.pdf