FSL -- When is it safe to skip the tulle?
So I was playing with Ultra Solvy and embroidery, and I found I could make freestanding designs without any support if they were made of A. Triangles or interwoven geometric shapes, B. Metallic thread on the bobbin and spool. The geometric shapes hold themselves in the right shape because of all the corners and cross bars acting as support. The metallic thread, due to its plastic covering, is stiff o the point where I can make freestanding charms to add to beading, even wobbly shapes or circles.
Here's the triangle shapes, based off the Sierpinski triangle:
So when else can I skip the tulle? I can't find any guides to designing FSL, only how to use designs that already exist.