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.
Vivid rainbow-hued motifs of red, violet, blue and green form interlocking star-like clusters with feathered yellow and magenta rims, set in a dense grid where red centers repeat in staggered diagonal rows across the field.
CC0 — use it for anything, no attribution needed.