Stu….
This is relatively easy.
Go to Google and run an image search on leaves that you are after. Once you find a nice one that suits your needs then save it to your PC. Open that image in Photoshop, adjusts the thresholds to give you solid black and white, select and then create a path, which you then expert as paths to Illustrator. You now have an Illustrator file with which to fiddle and tweak and ultimately save to eps with no hassle at all.
Viola!!
If none of that makes sense then send me a picture that you like and I will do it with explanations of the steps involved.
Give it a try though….. easy really.
Keith