On the right you see a close-up of the above fabric.
On the right you see an example of the use of a very ordinary object. I sprinkled rubber bands on my table, covered them with a piece of white fabric, and rolled over that with a roller. I had mixed up different thickened dyes, and moved from one color to another as I "inked" up my roller. After the first pass, the roller itself acquired a pattern; the rubber bands pressing into the foam made for a negative pattern of circles.
For the texture on the left-hand fabric, I used a small piece of some odd matting sort of material. It had been acquired by a friend at one of those industrial scrap recycling places. As I often do, I prepared two different thickened colors, and used them alternately on the roller.
The fabric on the left was patterned with a sample of plastic ceiling panelling -- the sort of thing one puts over fluorescent lighting fixtures.