In The Netherlands, Sinterklaas Eve (St Nicholas Eve) is celebrated on Debember 5th, the day before Sinterklaas' birthday, with much celebration. Sinterklass is an older man with long white hair, a beard, and dresses much like a pope. He is also said to be a fairly serious man. The Zwarte Pieten on the other hand are a bit more whimsical. They dress much like a jester, with the addition of an afro and blackface (yep, blackface). Zwarte Pieten jump around and act quite silly (even in the middle of a church service).
To view better pictures of Sinterklaas and his Zwarte Piet, click HERE.