Wearable computing device by genericsoma uses cheap materials and a Raspberry Pi computer - video embedded below:
I wanted to do something interesting with my RPi and a 2.4” TFT LCD. Google Glass was hot in the news, so I’ve decided to hack something similar. The semi-transparent mirror was extracted from Eye of Horus Beamsplitter, and the projection lens is cut from a plastic 3x Fresnel magnifying lens. The box and mounting parts are 3D-printed from ABS. Head strap is for GoPro. One RPi USB port is used for WiFi, and second for 2.4Ghz small wireless keyboard/mouse combo. All together cost around 100$.
This is the first version which has basic functionality, but hopes to include more features such as voice recognition and augmented reality.
You can find out more at the project’s webpage here