When Mega Construx first created the Destiny line, they released these two sets:
Both sets kind of (but not completely) have a samsara figure, but neither one of them is perfect. My version isn't perfect either, but it is a lot closer. It doesn't have a specific shader, I just used black and silver to differentiate the parts of the robe. Here it is:
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Here it is next to one of the official Samsara Warlocks
Custom Painted accessories
Edit: I plan to replace the robe with cloth (it's cardstock right now) to make it more poseable. If you guys have any more suggestions let me know in a comment.