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.
Dark green oval cells outlined in concentric bands of purple, blue and green sit within a rust-red ground, with mirrored teardrop and lens shapes forming a grid of rounded motifs that repeat in regular rows and columns, alternating between upright and sideways clusters.
CC0 — use it for anything, no attribution needed.