OMG - just seen these 8 by 8 WS2812 RGB 5050 LEDs sheets on AE for £0.76 or $1 USD.
https://www.aliexpress.com/item/1005009659290651.html
If I bought 5 of those sheets I could construct a cube that I could control from my mobile phone using BARRED.
How cool would that be ????????????????????????
6 sheets to form full cube and mounted on a corner would be nice.
How about an entire flat wall of them?! 
Would not like the Electrickery bill each sheet at max luminosity is 3.8A
Phew - just looked at the data sheet. Full brilliance for a whole sheet consumes 3.84Amps.
Multily that by 5 or 6 sheets means a hefty PSU or multiple feed-in-points.
Well that's only 19W (3.8A * 5V) per sheet. If they have the same characteristics as other WS2812 LEDs I have, I would probably run them at 10-20% of that figure.
I often find that LED's don't need anywhere near full power. And, of course, they will last longer when run at lower power.
I think I might name this project as... Cube-RED
Aliexpress is brilliant at dynamic pricing.
Dave saw them at 76p, I looked and they were 96p, now £2.17!
Looking back - I think the price I saw was a new-shopper-introduction (1-per-order).
Just looked again - price has indeed increased to £2.17
They must have "sensed" there might be an upcoming demand and increased the price.
Can be found at £6.90 for 6 inc VAT and free delivery.
Follow Dave's original link then scroll down and look for related items.
EDIT: now found some for £5.10 
OMG - that looks super-cool.
Did you order them from AE (as they must have been delivered very quickly) ?
Which micro-controller are you going to use to drive it?
Yeah followed your link to AE, then a bit more digging and they can be found much cheaper.
Mostly likely I will use an EPS S2 Mini, D1 mini would probably be OK as well.
I will flash with WLED.
(When I get my panels) I was thinking of driving each panel from a separate output pin - rather than connecting each panel in a daisy-chain as it might mean working out the NeoPixel position a bit easier.
WLED makes quite easy to "construct" the matrix in software, well worth a look.
But it could be done either way with WLED as you can combine outputs together.
I did change my mind about the layout, as when folded up the connections are touching each other 
Here's a link to WLED for people who may be interested in trying it out.
EDIT: Just tried to flash WLED onto an ESP32-S2-Mini and ESP-C3 - failed.
Then tried an old ESP8266 Wemos D1-Mini - success
They can be a bit tricky with the default web flash page, there is an alternative you could try
https://wled-install.github.io/
Just testing my new CUBE!
No prize for guessing what the text says
Just need to figure out a stand design to hold it on 1 corner point.
Woo - that is impressive.
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