Number 14 is a neat idea but there might be a little too much detail. I like number 4, it's very well balanced. And number 1 looks funky in an awesome way. I'd love to see it colored.
#4 is very cool and it seems like it could be used in a lot of places. #1 is a good idea that could use just a little bit more to stand out. #8 is really simple and effective.
Number 3 has potential! you could probably benefit from fiddling with the font and thickness of the lines a bit. also perhaps the n letter could be larger than the b to balance out the image.
I really like number 14 but I do not know if it would scale well, although I can just imagine the possibilities if you added color.
I really like number 4. Maybe do a little tweaking to the center of the B. The arrows are a good idea and work well with your initials.
# 4 & 8 are simple & will scale down good. i also like #14 but i think it would be hard to scale down you'd lose detail.
Number 4 is really great! The arrows work well with your initials. Number 3 has potential. Maybe move the "n" over to make it more connected? I also like number 14, but like others have said, scaling could become a problem.
My favorite one is #10! I feel that if you just proportion them equally and use the same shape for the vertical lines on the letters n and b then it will become more unified. It is simple and versatile.
I really like number 4. I would like to see it colored in and see how that turns out. I like how it's simple but memorable and easily drawn as well.
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Number 3 and 4 I like the most; I like they way the two letters are blobbed together and how each literally takes different directions. They're more interesting, yet simple, to me.