Black peppercorn (Piper nigrum) are made from unripe berries. Some
are processed by drying in the sun others may be kiln dried. I
suppose the sun dried ones may be germinable. You might also want to
give white peppercorns a try, the seeds have ripened a little more.

http://www.ipgri.cgiar.org/publicati...ns/52/ch42.htm
http://davesgarden.com/pf/go/2175/index.html
http://www.holistic-online.com/Herba...Herbs/h115.htm
http://www.harvestfields.netfirms.co...ack_pepper.htm
http://www.tradewindsfruit.com/pepper_pictures.htm

Pink peppercorn comes from Schinus molle.