This is my version of a NanoLeaf style light panel.

There is a base which can be mounted on a wall and a cover. The base contains a 11 mm notch where I've glued WS2811 LED Stripe (24 LEDs) in. So the LEDs will face the side wall of the cover.

The shapes do have cutouts on each side of the base to stack them together. To join two base units there is little "hexajoin" pice with a channel to route the cables. All other cutouts can be covered with one of the hexaplugs.

I use WLED to control the LED Stripes.