I'm sorry, I also am unaware of any free ones. I am in the process of writing a tutorial/ebook on how to make my style of flip flops. You can see mine at my website: A little girl s dream come true TuTus Costumes Pageant Wear Hair Accessories clippies headbands unique footwear nursing necklaces dog costumes and more
or my etsy shop (listed below). It should be done in about 2 weeks.
Those woven flip flops sound really cool too!!