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.
Layered blue and violet faceted star shapes fill the field, with glowing four-pointed rosettes with rounded, diamond-like outlines sitting in a grid at regular intervals. Lighter sky-blue rays radiate from the points between rosettes, so the rosettes and the star junctions alternate in a steady, evenly spaced rhythm across the page.
CC0 — use it for anything, no attribution needed.