I wasn't really happy with the RaspiCam mounts I've tried, so I designed my own. I wanted it to be raised slightly from the bed, and position the camera away from the bed a few inches.
It uses camera mount from here: http://www.thingiverse.com/thing:948307 and that mount just plugs into the bed-mount arm.
You can find the 24" flex cable I'm using for the RaspiCam HERE.
Here's an example timelapse from the camera mounted on this arm: https://www.youtube.com/watch?v=RVdlV_OcO8Y
This can be a difficult print as some of the supports may be hard to remove. With a bit of post processing though, it's a nice, snug fit on the print bed.