I've used size 20 fiber - Lizbeth crochet cotton.
The patterns are in a book I bought called Butterflies Migrating from Palmetto Tatters Guild
In addition to the simple butterflies, I've been trying some motifs from the book The Complete Book of Tatting by Rebecca Jones.
I continue to struggle with reverse work.
I seem to get the ball thread twisted & haven't quite got the hang of
the final join to complete the ring.
Will keep practicing.