We have been making lots of different surfaces and textures with textiles.
Using man made fabrics such as nylons and polyester lining fabric,
make great surfaces. You can colour the surface by transfer printing
with paper bags, transfer paints of crayons.
Then take a large piece of man made fabric and form a grid with
zig zag stitch at least an inch apart.
then pull up those threads and then you can iron it,
between two sheets of parchment paper.
It will form bubble like formations.
Enjoy having a go.