For my eco printing, I search thrift shops for natural fiber shirts that are in good condition. This is a silk shirt in a size small (6-8).
 
I used a variety of leaves found mainly in the North Texas area such as Oak and Pecan, with a sprinkling of Eucalyptus. The tag says to dry clean, but it should be handwashed in cool water with a neutral soap, rinsed, rolled in a towel and then hung to dry.