I designed this piece myself. one day I was playing around with an index card and figured it out. I was planning on making a tutorial even before I had found out that the model can switch into a different shaped heart. I do a lot more origami than this. I have a video on my Youtube account that shows nearly all of the origami I have done. There's also a link to my blog on the side bar>.
If you have any questions or comments, please leave a comment. Thank you for your time.
I designed this myself and I made a tutorial for it. Unfortunately I had to split the tutorial into two.
This second video explains how the two different models are formed.