Kalatheme now ships with Drush commands that mimic the subtheme generator GUI. Here are some basic commands to help you get started:

Basic commands and options

drush kalatheme "My Awesome Theme" 
drush kalatheme "My Awesome Theme" --fonts
drush kalatheme "My Awesome Theme" --custom=yeti
drush kalatheme "My Awesome Theme" --base-theme=kalasubtheme

You can use any of the following values for Bootswatch themes: cerulean, cosmo, cyborg, darkly, flatly, journal, lumen, paper, readable, sandstone, simplex, slate, spacelab, superhero, united or yeti.

You can also mix and match options like this.

drush kalatheme "My Awesome Theme" --fonts --custom=cerulean