Couldn't really think of another word to describe this method. 'Scrunched' seems as good as any.
Choose 3 or more colours* watered down, a sealable plastic bag and a pippette, (or spoon if you can't get your hands on a pipette).
Dampen the fabric with a spray and scrunch it into the bag. Start adding drops of colour on top of the fabric until you are happy.
Seal the bag and squeeze a little if you want the colours to blend more, or leave well alone if you don't. Leave preferably on a sunny window sill until the water droplets in the bag have become clear. You can then remove the fabric from the back for faster drying.
As with any of these techniques the results will depend on amount of paint to water and on how wet your fabric was to begin with.
I have to be honest with you here, this technique can be a bit hit and miss. Sometimes it comes out wonderful other times not so much. However, if you are not happy there is no reason why can't stick it back in the bag and splosh on some more paint, as I did with this one.
And, in true Blue Peter style, here are some I made earlier.
*I use Pebeo Setacolor Transparent/Light textile paint