Since I don't have enough black and white fabric to go to Grand Illusion Mystery I found some ways
I would love to share it with you here.
I used looms to make some ties over plain black fabric , then I dipped
it in bleach and it looks like this
The fabric covered with looms never changed and remained black
After removing the looms and rinsing it in water it looked like
Flowers and sun
Another way is when I drew instantly on the fabric using brushes in different sizes
What I realized the bleach left the blacks with ( reddish ) spots but not white instead of pure white .
Jellyfish was very obvious
Hearts and circles
But some fabric was too soft to stand the bleach. LOL
Any way it was fun to finish clue No 4 Grand Illusion Mystery
Here are some of my blocks