Not exactly custom, just isn’t standard literally. Microsoft shared some custom pipeline done up which made available for download on their site, BizTalk: List of Custom Pipeline Components. It’s posted under Microsoft’s wiki page (I didn’t know they have wiki sections now!) and another link posted under the same article shares good collection of articles BizTalk Server Resources on the TechNet Wiki. I’m posting it up here for my reference and anyone that might have interest in.