Check this kickstarter out... I might have to get one of these for travel, and consider it for a camping pillow. I can't tell if it locks you in to a sleep-on-your-back position or if it allows for a side-sleeping position. I can't play the video on my work computer, but it bears some investigation.
... time passes... I watched the video on my phone. It's definitely interesting as a travel pillow, but I'm not sure it would work well as a camping pillow. It does look like it won't allow for a comfortable side sleep.