there's a plugin named 'field' by tweakbench:



field is a multisample based ambience generator. using original field recordings by twerk, field allows you to generate suitable backing ambience for any track. version 1.1 adds a new interface, more responsive EQ, and small performance enhancements.

http://www.tweakbench.com/instruments.php?id=4

http://www.tweakbench.com/plugins/tb_field.zip