I built a Cheerlights-compatible Arduino-controlled RGB LED Holiday wreath using LEDs just like your 12mm Diffused Thin Digital RGB LED Pixels and documented the build (including video) on my local hackerspace blog (Sector67).
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.