Before the pandemic I would've suggested raspi & the official raspi display. But those are damn expensive.

The second option would be any cheapo Android tablet + Kiosk browser. It lets you have any web page visible and the screen turns on at voice/motion.

Or a more ready-made option would be an Elgato Stream Deck. You can customise the buttons pretty well.

If you don't mind a wired connection and a smaller screen you can use a USB-I2C bridge (such as https://www.adafruit.com/product/4471) with an I2C OLED screen and a couple lines in Python.

If you want it to be wireless you can build it around an ESP32 module or similar.

That looks like a stock LED panel, pretty cheap on Amazon/ebay and can be driven directly by a Pi (with a bit of wiring) or more simply via a Pimoroni RGB matrix driver. Search for 'HUB75' panel and you'll find plenty of stuff to play with.

You can get displays or a bluetooth speaker from DiVoom with a display that can be controlled from a PC, too.

I have the speaker called Timebox Evo with a 16x16 display. They used to be around $35 or so, i think now they cost $50. Its sound quality is mediocre at best but the display is nice, the app is pretty slick and the builtin battery lasts long. The build quality is also good.

product homepage:

https://divoom.com/en-de/collections/smart-pixel-speaker/pro...

github: (unofficial)

https://github.com/ScR4tCh/timebox

Yes! This one is half the price, but a bit more fiddling is required: https://shop.pimoroni.com/products/cosmic-unicorn

USB-C plugged into mains electric