I have only very recently discovered this Japanese percussion group (the Kodo), I suggest several listens to you. They seem very evocative to me and create interesting atmospheres using rather simple rhythmic patterns or at least ones without great peculiarities. Enjoy the listening.
http://www.youtube.com/watch?v=thQ1VAyJWHw
http://www.youtube.com/watch?v=kI4Mqb5_jJU
http://www.youtube.com/watch?v=sSi7PyJMj3A
http://www.youtube.com/watch?v=Wm8UAxpB9cY
http://www.youtube.com/watch?v=8zSa6Zz2Zrs
http://www.youtube.com/watch?v=NOUi5fDm0KE
http://www.youtube.com/watch?v=qyGaK1FR6gU
http://www.youtube.com/watch?v=p-M18Rb98So
http://www.youtube.com/watch?v=Ron17xFNBf0
