A quick note:
I wasn’t able to edit my K2 styles from within Wordpress edit themes interface. I solved this by creating a symbolic link to the .css file from with the K2 directory. From your K2 dir ( blog/wp-content/themes/k2 ):
ln -s styles/mystyle.css mystyle.css
Problem solved!
Hey thats pretty smart. Nice trick. This should be added to the install routine of K2.