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.
Black and white ornament with faint magenta and blue accents forms interlocking medallions, each a bold white ring around dark rounded cells centered on a small open square. Four-way diamond-like forms of white lobes sit between them, and the motif repeats in a regular grid of alternating medallions and cross-shaped shapes, giving a steady, rhythmic lattice across the page.
CC0 — use it for anything, no attribution needed.