On the 6th floor (the party room floor), we run a strip of blue painter's tape down the middle. One side is clearly marked as the "stand here/mingle here" side, the other side is the "travel here" side. This has been wildly popular because previous the hall was filled with minglers and was quite difficult to move through.

You can read more at the Geek Feminism wiki if you like:
http://geekfeminism.wikia.com/wiki/Accessibility