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.
Concentric rings of blue, teal, green, yellow and red-orange form pairs of overlapping circular medallions, each pair meeting at a small diamond-shaped motif, arranged in staggered columns and rows that repeat at a steady vertical and horizontal rhythm across the surface.
CC0 — use it for anything, no attribution needed.