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.
Dense field of glowing oval cells in blue, cyan, yellow and magenta, each ringed by concentric bands that shrink toward red centers. Interlocking star-like clusters and cross-shaped junctions recur in a grid, creating a rhythmic, undulating overall texture.
CC0 — use it for anything, no attribution needed.