Japanese Arduino enthusiast Kimio Kosaka has created a skeletal version of an Arduino-compatible board - not something spooky, but called this as there isn't a PCB. Instead, he connected the circuit up using steel wire, and soldered the components to the necessary points - creating a single-sided Arduino board without a PCB. Check it out in the following video:
If you're wanting to reproduce the project above - we've got you covered with our new ATmega328P MCUs with Arduino Uno bootloader:
This is the same Atmel AVR ATmega328P microcontroller used in the official Arduino Uno, as well as our Eleven, EtherTen, USBDroid, and other boards. Perfect for building your own Arduino-compatible project directly on a breadboard or on a custom PCB, or for replacing the MCU in an existing board. Comes with the Arduino Uno bootloader pre-installed. Better still, it even has a special label stuck on top with details of the pinout, so you don't even need to look up the datasheet when connecting it up in your project! For more information and to order, click here!