There are these cool LED light boxes you can build and program. It comes as a kit of LEDs on leads and you either plug them in or solder them onto a base pcb, depending on the kit. The you can do some very light programming to create your own 3D light show and pictures. A great and fun introductory tool for burgeoning engineers.
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I will interject and say.. DO NOT attempt one of these..
It's not that it's hard.. or boring..
BUT omg.. you will rip hairs out soldering this thing together..
It looks easy on the internet, but jesus it is super super tedious..
You will also need a jig to bend the leads perfectly straight, otherwise it'll look crummy and non-cubic..
Even 8*8*8*2 = 1024 solder points
Now imagine 16x, 8192 solder points..
Now imagine 16x @ 3x leads for rgb, 12288 solder points