Jin Saotome did a pretty good likeness of a Fallout 3-esque BoS warrior.
Here's what Kotaku has to say about it:
Heeeey, it's Jin Saotome! You remember Jin Saotome, right? Talented kid. Makes his own custom action figures, official licensing deals be damned. This is one of his latest gaming-related works, a member of Fallout's Brotherhood of Steel, circa Fallout 3. The gun's a bit too futuristic, but the guy himself? Totally nailed it.
Looks like Matt Grandstaff himself is the one who found it, and posted it on the Bethblog (at least that's how I'm reading it.)
You can check out the shots over at Kotaku
Or check out Jin's angelfire site here