Hmm. I'm sure there are tons out there, and probably free ones as well as paid.
I did a fast google and found this one on etsy:
http://www.etsy.com/listing/77784887...eafvine-twisty
This thread has a ton of various twisty recipes, you can peruse it to see if you find one that appeals to you for leaves:
http://www.lampworketc.com/forums/sh...=vine+tutorial
To me it's more about making the right type of twisty and then application of said twisty by swipe method or by using a tool to add crease/pull tips, etc.
Hope this helps some?
Edited to add: You could also try this feather tutorial from Sislonski and use leafy colors:
http://www.lampworketc.com/forums/sh...d.php?t=241868