Really like how #23 combines the two Ns to look like a waveform. I'm wondering if that could be done with just a simple 2 green Ns on a white background rather than using the negative space of the green and gray bars.
Could we see #34 with the Ns being solid green (without the horizontal white lines)? And then maybe another with the Ns solid white within a green circle?
For the ones with the two-tone emblem, (#96, #97, #100, #101) could you have both segments be green? instead of half green half gray? A very subtle green gradient would be OK too
#137 - definitely the strongest. Would be great to see a smoother waveform or maybe a bit thinner. Some variations to add to a softer waveform while still keeping the N letter resemblance.