[mod]

Not exactly a script, but I work at home and sometimes I need to drown out the kids (or the wife!). I have this in my .bashrc:

alias whitenoise='play -q -c 2 -n synth brownnoise band -n 1600 1500 tremolo .1 30'

It plays some fuzzy whitenoise, which drowns them out and lets me keep focused (music is often distracting to me).