The last link in particular seems to be getting some attention. I haven’t reviewed it myself. It’s not packaged up as an installable theme, but if you’re handy with github, you should be able to tinker with it. It’s free.
Regards,
Alec Smecher
Public Knowledge Project Team
I found this responsive theme created by the guys at openjournalsystems. It’s GPL.
It’s pretty much ready to use, although you need to change your banner and change some css code to fit your liking.