Instructables user imaseahawksfan made these LEGO valve stem caps for his motorcycle. I think they look great, and this technique is easily translated to all sorts of valve stem caps. I’m thinking they would look great on my bicycle!
Becky Stern (sternlab.org is a DIY guru and director of wearable electronics at Adafruit. She publishes a new project video every week and hosts a live show on YouTube. Formerly Becky was Senior Video Producer for MAKE. Becky lives in Brooklyn, NY and belongs to art groups Free Art & Technology (“release early, often, and with rap music”) and Madagascar Institute (“fear is never boring”).