'Improv' means, roughly making something using the material to hand (literally when it comes to patchwork.) But the thing about improv is that it's not really random - there's always some kind of structure. For example in improv jazz there's an underlying chord sequence, and in improv comedy, or poetry, it makes sense (usually).
So there are generally some kind of constraints. In quilt-making you can choose to put your own constraints on the process by choosing a limited pallet of colours for example but there other practical constraints too - like where to put seams!
I found this a fun challenge - I thought that it would be a good excuse not to overthink things, but I was wrong!
Here is my quilt, inspired by the jumble of textures in the garden where I work. You can read more about it on my blog