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Go to any bicycle shop and ask for old presta valve tubes. Presta valves are an all metal valve and you'll want the ones that are threaded all the way down the length of the valve. Ask for a couple of the presta valve nuts as well. You should be able to get more than you need for free!
Flashing L.E.D. using 555 Timer
555 Timer Flashing Led
Mini Arduino environment monitor ** UPDATE - Added RTC ***
Powerful Modern Homemade HDTV Antenna
Clearing Replicator 2 Nozzle--PLA
Androino! Control an Arduino from your Android device using a cheap bluetooth module.
Turn a pencil drawing into a capacitive sensor for Arduino
Bent Plywood Night Stands
Wireless outdoor Arduino weather station with PC logging and Graphs
Standalone Arduino / ATMega chip on breadboard
Vernier Sensors and Arduino (or Teensy) for Data Logging
Interactive Multitouch Display
How to build a Multi-Touch surface
Building a "Baghdad Battery"