We were given several images of leaves to inspire us, and to incorporate into our collages if we wanted to. Here's the strawberry leaf image provided by Eila (she scanned a real leaf):
And here's how I incorporated it (and some strawberries) into my digital collage (the leaves are in her hair and in the background). I used the "chalk and charcoal" filter to give it a hand-sketched look. Image credits: graphicsfairy, artefacts.