A Japanese Flowing Cherry tree:
Purple Leaf Plum Trees
I found this product: http://www.sceneryexpress.com/JAPANESE-CHERRY-LEAF-PETALS-16OZ-SHAKER/productinfo/653-6542/ and shortly after found this review by TerranScapes...but as you can see, it still doesnt really give a good example of how to make these trees (yet?). Skip to 2:16 for the review...or follow the link he adds in the upper right hand corner as the video starts.
I'm still at a bit of a loss on how to do this, even though I have this neat product - because it doesnt seem thick enough to make trees with in my usual way.
More research is needed. I'm wondering if anyone has experience with this product?
NOTE: I found a new item in Catalogue #17, called "Pull Apart Plant Cluster" (an example is here):
Polyfiber product. I may look into this.