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.
Green fern fronds in bright emerald and deeper forest tones radiate outward from a central cross-shaped star on a near-black ground, each frond curving toward the centre of its square. The motif repeats in a regular grid of square clusters, with small X-shaped star forms filling the dark gaps between them to create a rhythmic, checkered rhythm.
CC0 — use it for anything, no attribution needed.