Send in the clones
Clone stamping is a great way to quickly generate a base for your design. Have your Clone Stamp tool selected with whichever brush shape you desire. Next, sample an area of your painting with the Color Picker tool. Now you’re able to clone that sampled area anywhere. It’s great to use as a base for painting over later. Be careful not to rely so heavily on it that your design ends up looking like the same shapes have been copied and pasted everywhere.