The 4 Chord USB MIDI keyboard. Play all those hit pop songs using the infamous four chord progression (I-V-vi-IV) with just a press of a few buttons.
A "smart" and utterly useless IoT power plug that tells you via Android app and tweets whether you plugged it in a power socket or not.
The "fitness tracker" Android app that counts the steps you're walking while roaming around like a maniac during phone calls.
Illuminating a wooden, DIY shot glass tray as mood light for a party, including a drinking game as easy and effective as Heads or Tails.
Integrate the Nokia 5110 LCD into own PCB designs and create display data and animations straight from XBM images.