A creative way to make custom selections using the Brush tool and Quick Mask mode
On an open image press Q to enter Quick Mask mode. The Brush tool set to black can be used to add to the Quick Mask.
But did you know you can use any Brush? Choose this leafy one, for example, from the Brush Presets palette and adapt tip settings such as Scattering and Spacing.
Paint onto your image to apply your custom brush to the Quick Mask, and then hit Q again to view this as a new selection!