Procedurally generated areas in 2D

I have a grid system in my game and I want to procedurally divide squares into long islands like provided image:

My idea was to create a node-system with 2D coordinates, and then add a direction and distance to add the next node. Then, all the squares surrounding the nodes gets added according to a certain radius, see image:

Is this a viable way of generating these kind of areas, or is there a better way? And if that's the case, any tips on how I could implement this in a good way?