High contrast objects are great for stimulating a baby's visual development. This post has information about visual development and free printable graphics.
10 versions du jeu des doubles à imprimer gratuitement
Printable - "Spot-It" game cards with images of ocean animals and associated objects
High contrast black-and-white patterns are perfect for a newborn’s visual stimulation and development. While adults can clearly distinguish between all colors, babies can decipher only the high contrast of black and white! Check out Bright Eyes baby blank
DIY Montessori Octahedron Mobile- can't read the site, but the picture tutorials are good!
article about baby's vision & preference for black & white patterns and circles as favorite shape.make a crib mobile with black & white patterns?
high-contrast stimulation images with the science about why this is helpful for newborns