This is jigsaw puzzle pattern background, of gray shades flat colors, with seamless pattern included in swatch palette (pattern fill expanded).
It comes as vector EPS8 file with additional 4500×4500 300 dpi high res JPG raster file.
Raster seamless pattern (swatch, or repeat pattern), pixel aligned, is included, too. It comes in two sizes and formats, 900×900 JPG file, and 200×200 PNG file.
It is easy to recolor both the pattern and background.
For live examples of use see these pages: http://graphicriver.net/item/decorated-numbers-and-arithmetic-signs/5354119 http://graphicriver.net/item/st-patricks-day-maze-game-for-kids/5353582 http://graphicriver.net/item/visual-math-puzzles/604745