I can't recall where I got this, but I find the generated noise really good at reducing the distraction from co-workers' conversations, and it's not as boring as straight noise

  play -n synth  brownnoise synth pinknoise mix synth sine amod 0.2 60

'play' is from the SoX package

https://mynoise.net/NoiseMachines/cafeRestaurantNoiseGenerat... is oddly helpful. The unintelligible babble sounds cover up real chatter.

Brown noise?