Here is a great use for a ton of shiftbrights, it’s a DIY breathalyzer that uses an Arduino to monitor a Gas/Alcohol sensor and display the results on a big row of LEDs.
Via: LED Projects
“The 25 Shiftbrite modules are lined up in a column, which is connected to an Arduino tucked away in a cardboard box and are powered by a 4.5volt 500mA adapter. The Arduino takes readings from an MQ-3 Gas/Alcohol sensor.”