blue, purple, pink and yellow paint stains on the canvas. brushstrokes of watercolor on the diagonal. non-uniform rough texture

abstract acrylic art background blob blot blue brush color crayon design dirty drop dye fluid gouache grunge hand ink marble navy non oil old paint paintbrush pastel pattern plaster retro rough sketch smear splash spot stain stroke stucco surface template texture textured uniform wall wallpaper water watercolor wax white