It may be on a T shirt or it may be on a bag, either way it will look awesome! A simple DIY weekend art using your arduino and a few more common components.
Using an Arduino, a 9-volt battery, and eight ping-pong balls with a white LED inserted into each one, the ring of dots lights up in sequence, endlessly chasing its tail waiting for a non-existant video to load. A giant F5 refresh button would have really completed the costume, though, since that’s everyone’s secret weapon for getting a YouTube clip to finally load.
[original story: Arduino Blog]