Pretty simple project. Just a printed part, a couple of LED's, An ATTiny 85, coin cell and button.
Wear it to the club and RAVE LIKE A MADMAN \o/ You'll be amazed at the attention you get!
.STL here: http://www.thingiverse.com/thing:280136
https://www.youtube.com/watch?v=fvUvGontuDA