Adafruit has another great DIY project with wearable technology. They show you how to make wearable RaspberryPi display where the display attachment is 3d printed and can be attached to standard glasses frame. It's a sort of DIY Google Glass but with separate processing unit, no camera or even mobile internet access.
Here you can get the STL files:
Detailed guide on Adafruit learning platform:
Here are some other similar projects: