Help on starting this material - new to substance designer

Cube Republic

I'm new to substance designer and am attempting to make something like this https://garden.org/plants/photo/375190/ I've been experimenting with horizontal noises such as anisotropic noise, tile generators etc, but am finding difficult to get it look random. I'd like some large forms and small forms mixed up.  Also does anyone have any pointers on making the pattern that forms the outline of the fine plates? I've tried grunge 5, but am finding it difficult to get a fine edge to start as the basis of a mask.  Here's some more ref: https://commons.wikimedia.org/wiki/File:Ceiba_pentandra_MS4104.JPG
http://www.thesurvivalgardener.com/kapok-tree-portraits/