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I'm exactly the wrong person to ask for b&w /o\, so I haven't checked out these tutorials myself.

Here's my list of icon tutorial memories (isn't lj's way of showing memories great? i wish dw had that) :

https://tinnny.livejournal.com/memories/?ukw=icon%20tutorials%20(by%20other%20people)&skw=all&security=all&sortby=memid

most of the ones I found in the list aren't about b&w caps and/or are broken now, but here's one that goes into detail about what to look for in a cap when you want to make b&w icons:

Black and White guide by absolutelybatty

and here's a list of b&w-related tutorials, but I didn't check if any of them still work or are based on b&w caps:

https://icon-tutorial.livejournal.com/8706910.html

Basically, your best bet for icon tutorials is still to browse old lj icon tutorial comms/lists.