I've held this block until last because it's the most time intensive one.
I've used a snippet of a basket weave fabric, fabric with multiple leaves, along with several shades of gray fabrics. Varied other small pieces were used with the tree bark fabric being the largest piece.
I added a partial red wheelbarrow to make my block stand out at bit.
I auditioned many fabrics on this one so you might want to do the same in order to get the scales and depth in your block.