Impress textures into air-dry clay
A texture reads clearly when it is pressed once with control and the slab keeps an even thickness.

Start with a simple surface
Coarse cloth, a clean leaf, or a blunt textured object can impress an air-dry slab. Begin with a pattern containing a few clear lines. Fine details can disappear if the clay is too wet or smears during release. Test a small scrap to see whether the chosen object sticks or leaves residue.
Use tools that will not casually return to food contact after being contaminated with craft material. Leaves should be clean, dry, and safely identified; an unknown irritating plant is not an essential craft supply. Remove bulky stems if they would make a channel too deep. The aim is to change the surface, not cut through the slab.
Prepare an even starting layer
Roll the clay between equal-thickness guides to a thickness suitable for that product. An even surface makes the result easier to judge. Place the texture and press steadily from one side. A roller can distribute pressure, provided it does not keep reducing the slab's thickness as you work.
Peel the texture away slowly from one edge rather than dragging it sideways. If the result is unsatisfactory, smooth or rework the sample while the material is still workable. Pressing again after the texture has shifted usually creates a doubled impression instead of a sharper one.
Plan the outline and drying together
Cut the final outline after impressing it so small changes near the edge do not matter. An untextured border can give the pattern some visual space. For a hanging piece, make a suitable hole away from the edge while the clay is soft. Allow for possible shrinkage and test the intended cord on a dried sample.
Dry according to the product instructions, keeping the piece flat without trapping it against a rigid surface. Treat it as decoration for a dry indoor location unless the maker permits another use. A darker color in the recesses may emphasize the relief, but test paint only after full drying. Thick paint can fill the very lines you intended to preserve.