Media centre-infused smart speakers and Bluetooth speakers are pretty common these days, but over on Hackaday, user Carlo Maria Curinga made one of the slickest looking little speakers we've seen yet.
The hardware here includes a Raspberry Pi, a DAC, an amp, a speaker and a little LED matrix for visual feedback. On the software end, the speaker functions as an MPD and HTTP server, and it can pull audio from a number of online services like Spotify and YouTube. You can control and send music from your phone to the speaker easily. All told, it's a nifty little system that's pretty easily to manipulate to suit whatever needs you might have. You'll find everything you need to make one for yourself over on Curinga's site below.