Blue | Check | Pattern-Wallpaper / Desktop Picture / Background / Free
No People / Margins / Lights / Photos / Solids / Paints / Walls / Wallpapers-There is also business clip art for work.
Blue | Check | Pattern --Background image | Free material
Blue | Check | Pattern --Background | Free material --Full HD size: 1,920 × 1,080 pixels
Free Image Download
PictArts