I start by accumulating some leaves and grasses, chosen for their interesting shapes, a soft brayer, paint and a support.
My first trick is to place the foliage on a support, cover with a sheet of paper, and use several passes of the brayer to flatten the heck out of the leaves and grasses. This makes it much easier to create an impression.
Even the mat board that is being used when I'm coating the greenery has interesting patterns - another start, for another time.
A second colour and another layer is applied in the same way.
A soft wash of quinacridone gold over all, with a paper towel scrunched into the sky area to create interesting variation, and
my play is done for this set of foliage.