The Lava Lamp has been around for many years, but it's never lost it's popularity. They look effective, and are often a feature piece in bedrooms. Dunelm have reduced two of their Glitter Lava Lamps from £10 to just £5, and they look freakin' awesome.
Glitter Lava Lamp
These really are calming and create such a laid-back atmosphere in rooms. No wonder they were big in the 70's, they definitely kick off those retro, groovy vibes.
Both lava lamps come with a 2 year guarantee, and they are battery operated.
If you have a child with sensory issues, then these can be gently stimulating in all the right ways. They are fine to use, so long as they are out of reach from kids.
There's also one with glitter stars* in, that's also just £5.
Click and Collect is free from a Dunelm store near you, or pay £3.95 for home delivery.