Find your base
Choose one quiet material that can carry the room: warm plaster, pale oak or a textured wool. A consistent base makes it easier for the other elements to sit together without competing.
Add a deliberate contrast
Contrast need not be loud. Smooth stone against a woven textile, or dark timber beside a pale wall, can create enough definition. Try keeping the colour range narrow while varying the surface.
Look at real samples
A screen cannot reliably show how a material feels or changes in daylight. Request physical samples and examine them together in the intended room. Look at them in the morning and again under evening light.
Specify what matters
A moodboard should distinguish visual preference from performance. Record maintenance needs, suitability for children or pets, and durability expectations. Product selection should follow those requirements.