This is a very easy technique. It's just liked the "Texture your Flowers with Magic Mesh" technique that I've shared sometime ago.
Here are the steps.
1) Draw some leaves on a vellum and cut it out. Ink it's edges with distress ink.
2) Paste it onto the sticky side of the Magic Mesh. Face the leave right side down. Trim the extra mesh around the leaf.
3) Ink it with distress ink again. Add some glossy or sepia accents onto part of the mesh to create a wet look to it.
4) Before attaching it to your project, bend the leaf outwards for some dimensions.
Try creating some of these leaves for your next Spring project!