If you or your kids are building a robot, why not give it a face? This kit from 4tronix will give you a mouth and eyes that you can blink, change colour or animate a smile, frown or other mouth expressions.
Each RGB led is individually addressable, this means you can program it in very detailed ways. I have backed this as I think it is a nice little kit to learn soldering and Neopixels.
Click here if you want to take a look at the backing options and get in whilst the £7 option is still available!