I toyed with the idea of dropping some neopixels into a poster back in 2014. This is the final result. It consists of an arduino nano hooked up to 20 pixels. The program driving them is just Adafruit's strip test program.
I made this magic mirror for a friend. It features laser cut oak for the case and a motion sensor that can be switched on and off. It uses a Raspberry Pi and the standard magic mirror images you can find floating around on the net.
I made this for a friend who just had a baby and is a fellow Harry Potter fan. I embedded a magnet in the tip of piece of driftwood for the wand. There is a Hall Effect sensor in the mobile that detects the magnet and turns the device on and off. Like magic!
This is an Arm Mounted Computer replica from the popular video game Fallout. It features a 4.2 touch display, rechargeable battery and is comfortable to wear. Battery life is about 5 hours, making it a perfect addition to your cosplay theme.
This is a test to see if a small parafoil can be guided autonomously. The results were successful. NASA has been working on a similar concept to get sampled from the International Space Station back to Earth.