Bluetooth speakers are a great way to bring music with you wherever you go, but they're often pricey. If you'd rather make the speakers yourself, Instuctables user ASCAS shows off how to make one for around $15.
The build here uses a small amp, speakers, a Bluetooth module, charging module, and a few other smaller parts packed into a eyeglass case. You'll also need a cordless drill, rotary tool and a soldering iron to put everything together. From there, it's all about putting everything together inside the eyeglass case. The end result is your own tiny speaker that can go with you anywhere.
DIY Bluetooth Speaker [Instructables]