thread Hola!
This rather has my name on it...

Let me have a think. Must be something around that's reasonably cheap and cheerful, or some things that can be hooked together without too much pain.

If you're prepared/able to put a bit of appropriate work in, something with a Pi/Arduino would be easy enough... have it serve a webpage for controlling it, stick it on the wifi, and they can control it from phone/tablet. It's easy to get cheap chinese colour-changing LED tapes and hook them up to a Pi/Arduino, like cowjam did recently...
permalink I saw 100 individually addressable RGB LEDS on a string for £15 earlier
but didn't buy it so don't have a link.
permalink History?
permalink No I was in app
Not I've found them #Aliexpress £7.93 | 50-100PCS WS2812B LED Module String Panel Pre-soldered on Heatsink with 10CM Wire 5V WS2812 Built-in SMD5050 RGB Idividually
permalink God that's cheap.
I know they'll be a bit iffy but for home/hobby fun, that's fantastic.

And matt - I think one of these would work with it: https://www.aliexpress...

The App actually looks usable (ie it isn't in Chinese)...

This stuff is so cheap that it's basically worth a punt.
permalink Oooh...
we're approaching that time of year when I get reminded that spunking money on AliExpress isn't really affordable...
permalink thank you
I'll have a look
permalink is one of these

and one of these

a but too simple?
permalink they're both the same thing
but I can see what they say
permalink oops
basically one of those starry night projectors and an app-controlled plug
permalink thanks
just trying to get ideas at the moment
permalink That's good thinking for a simple solution...
If they just need to be able to turn something on and off, a wifi plug and whatever lighty toys you can find.
permalink Unbranded wifi plugs are fine.
Mine are yagala and are significantly cheaper, work with alexa, Google and have a free and easy to use app.
permalink thanks
to be honest at this point everything is an option
permalink I've not had chance to play with it yet, but I've just bought one of these
#Aliexpress £7.24 | M5Stack Official 2020 New Arrival ATOM Matrix ESP32 PICO Development Kit Arduino IMU Sensor Python

It's an esp32 with addressable rgb led square that's also a push button.

In other words, it's a programmable wifi doodad with a colour display that's also a button.
permalink This thing is awesome.
I'll have a go at some light pattern stuff.