One of my most musical Christmas gifts as as a kid in the Sixties was a light blue plastic Rosedale organ.
Here's one I saw on Ebay.
I managed to pick one up at a car boot sale years ago too so its back in my hands.
It produces a sort of church-like sound, which when notes and chords are combined, is quite beautiful. I loved messing with it as a young Rick Wakeman.
Probably its most famous public airing was when David Bowie no less, played it on the song Memory of a Free Festival on his early Space Oddity album. This is the Wikipedia entry about the song.
You can listen to it on You Tube.
Did you have a Rosedale organ?