Natural Methods to Start Labor?

Finally close enough to try to get this boy out! Does anyone have any tricks they have tried to move things along? I'm not looking for something as hardcore as castor oil, I just want to give him a nudge in the right direction as I'm already quite dilated/effaced and he's measured very large...mama is uncomfortable! I've been bouncing on my yoga ball and drinking pineapple/mango juice. Any suggestions?