Basically any "Arduino compatible" that runs an 8-bit AVR with an 8-16MHz clock will work. Additionally, the Arduino Due and Teensy boards are compatible with the Neopixel lin.

There ended up being plenty of room inside the speaker box to cram an Arduino Pro Mini 3.3V, the RN-52 Bluetooth receiver, and the rest of the components, with an aux cable running out the base of ...

An Arduino Pro Mini drives an LSM303DLHC compass/accelerometer breakout board and a 12-LED NeoPixel ring. The heading is indicated with a red ‘Pixel between two yellow ones.