A free Calligraphic, Splatter and Art Leaves Brush Set for Adobe Illustrator from SacroDesign. You can use it to draw vector leaves and branches. To do so, load the PDF file with Adobe Illustrator, open the brushes panel and apply a brush of your choice to an active path...

This work is licensed under a Creative Commons Attribution 3.0 License. Download

Note:In case the brushes don't appear in your panel, try to use the "File>Open" method when loading the PDF.