How to Create Growing Coloured Shapes

Question

I would like to create an effect where I draw an irregular non-enclosed shape and fill it with a translucent colour. Then I want to be able to draw a larger irregular non-enclosed shape outside of the first and fill the difference between the two with a different translucent colour and so on and so on. Ideally I would like to have each separate differently coloured "growth" on it's own layer. I'm at a loss how to (1) fill a non-enclosed shape, (2) fill only the difference between a larger and smaller shape.

The effect I'm trying to create is illustrated below. This shows opaque colours but I'll be making mine translucent which I know how to do.

Any help gratefully received.

hatstead · Answer

Ikrananka wrote

Ideally I would like to have each separate differently coloured "growth" on it's own layer.

Open a blank, new file from the File menu
Activate the polygonal lasso tool (keyboard shortcut L), and "draw" the irregular shape to suit.
Set your foreground color chip to the desired color
Go to Edit menu>Fill selection - with foreground color
Press CTRL+D to get rid of the marching ants
Open a blank layer above this
"Draw" another shape above this
Change color to a contrasting color, and fill selection
Repeat this process.
This should place all shapes on separate layers.

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