Really? I see:
A DIY weather station kit that feeds its data to the Raspberry Pi: https://www.tindie.com/products/tmhrtly/airpi-kit/
DIY Amplifiers: https://www.tindie.com/products/diyourfaceoff/fully-assemble...
A DIY 8x8 LED games console: https://www.tindie.com/products/hotchk155/sixtyfourpixels-lo...
DIY musical instruments: https://www.tindie.com/products/hotchk155/le-strum-hack-it-y...
TTL Tennis for Two: https://www.tindie.com/products/wmbuchholz/ttl-tennis-for-tw...