I have used a crochet cotton thread for the first seam and a silk floss for the second one
The greenery is Anchor perle
I have used a Ginnie Thompson flower thread and black fine wool.
Here I used a heavy knitting cotton for the first layer and a mercerized, medium weight crochet thread for the top one and more of the Anchor perle.
The Lystwist thread was in a drawer with many other threads, on cardboard reels and when I picked it up I found it had come undone and tangled beneath most of the others. What a mess. I gathered it all up and sat untangling them when my lovely DH saw me and said “You need spools for that lot” and immediately went and made me not one, but 4. Here they are. They stand about 3″ high and are 2″ wide.