Sun printing with Setacolor paint is one of my favorite techniques. I try to make enough leaf printed fabrics for the year during high summer before the leaves start to wither and fall breezes complicate the procedure.
Here I am gathering leaves of the plume poppy, a plant which grows to great heights and can be invasive.
Paint is thinly applied to the fabric:
Leaves and other objects are placed on the fabric and the fabric is left to dry in the sun. The variable drying time between the fabric and the objects causes the printing.
Here is a finished fabric on which I placed water lilies and their stems:
I used sun printed fabrics in the upper left section of Garden Shadow: