Black, green, brown and yellow.
Its bites are dangerous, but very rare. Other, harmless snakes have similar colors in a different order. The rhyme red and yellow kill a fellow can help you remember that the coral snake's red and yellow colors touch, but the harmless milk snake has red touching black. Common garter snakes are highly variable in color pattern. They typically have three light stripes that run along the length of their body on a black, brown, gray, or olive background. The stripes can be white, yellow, blue, greenish, or brown. There are no colors a snake can NOT be. Snakes are found on nearly  every continent in the world in an array of colors. Sometimes those  colors are vibrant, while for some d … ull-colored species the need to  blend in to their environment is essential. There are no colors a snake can NOT be. Snakes are found on nearly  every continent in the world in an array of colors. Sometimes those  colors are vibrant, while for some d … ull-colored species the need to  blend in to their environment is essential. No matter what shade or  color combination a snake has, each snake's color is key to its  survival as both hunter and prey. The most common snake colors are  black, green, brown and yellow. 1 person found this useful. Different species of snake can often be distinguished by their characteristic color patterns. Some are single uniform colors. Others have dark or light markings organized into stripes, spots, blotches or some other pattern. Examples of the major types of color patterns are illustrated here.
http://tpwd.texas.gov/kids/wild_things/wildlife/snakes.phtml http://www.biokids.umich.edu/critters/Thamnophis_sirtalis/ http://www.answers.com/Q/What_is_the_color_of_snakes http://www.answers.com/Q/What_colors_are_snakes http://www.answers.com/Q/What_colors_are_snakes http://www.flmnh.ufl.edu/herpetology/fl-snakes/color-pattern
what colors are snakes