colourful or rainbow gift ideas

[PinkDaydreams]

Hello all!
I'm wanting ideas please for my will be 4 year old son for Xmas/birthday gifts. He has autism and loves rainbows and colourful things, for example the battery candles that change colour.
He's already got one of those colour changing spinning wands that he likes but it eats through batteries!
Any ideas welcome!

I have that exact rainbow cushion saved on my Amazon wish list!!

Love the twirling ribbon as that can be used in the garden in the spring/summer.

I've been trying to find something similar to a lava lamp as I'm worried he will want to touch it and burn himself.

For anyone else interested, colour change bath tablets were mentioned on the bargain thread, they look good, on Amazon a big tub for around £15.