At the bottoms of both cakes, that is a border of acanthus leaves. On the 3-tier cake, the one in the middle is probably also acanthus leaves, a little stylized and upright.
https://www.etsy.com/listing/108861469/fondant-mold-for-acanthus-leaf-with (or similar).
I didn't find the one with the drop pearls.
It's often called bear grass. https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1631&bih=922&q=bear+grass&oq=bear+grass&gs_l=img.3..0l10.1833.3730.0.38184.108.40.206.220.127.116.11.1397.0j6j2.8.0....0...1ac.1.53.img..0.10.1399.T6BVk-AX0uc