Bunnings Candle Modification

I bought a large (70cm or so) battery operated candle from Bunnings.
Takes 3x AA batteries and has a couple of yellow LEDs to simulate a candle effect. Nothing special.
But of course, I couldn't leave it at that, and now it has 16x WS2812b LEDs in the top of it; so that all sorts of effects can be run and it can be included in the display.
This video has a sample of the effects etc I played with after I got it set up.