A background should sit behind the text, not in place of it. This paragraph lies on the tile at its true scale — if it reads without effort, the tile can go under content.
Charcoal-gray scalloped rings with beaded black inner edges sit on white, forming rounded quatrefoil-like frames that link through diamond-shaped gray lozenges at the junctions. The frames and diamonds alternate in a staggered grid, with rows offset by half a cell so the eye travels diagonally across the field.
CC0 — use it for anything, no attribution needed.