If you saw one it depends where you live, but it could be one of the following:
green tree snake: http://las.new-England.net.au/wp-content/uploads/2007/03/images20070304-035-treeSnake-sml.jpg
http://www.tvwc.org/AssetsGreenTreeSnake.jpg
green tree python: http://www.kingsnake.com/ihs/I.H.S.%202005%20PHOTO%20CONTESTHeat%20pits%20of%20the%20green%20tree%20python%20-%20Michael%20D.%20Kern%20-%20IN%20CAPTIVITY,%20SM.jpg
rough green snake: http://www.wilddelaware.com/wp-contentrough-green-snake-11832.jpg
natal green snake: http://api.ning.com/files/L1ySGyMwLZ3hID057bBHbPN6Eqw8ML160RN4P6rDPxM_NatalGreenSnake.jpg
Asian green snake: http://www.dekayi.info/R_I_P_%20Green%20snake_filestree2.jpg
Hope this helps.
Yellow on top with the body yellow and white mixed,, And
An Aussie snake
A young common grass snake
Bright green ! See related link for a picture.
Green, Orange and Yellow
Snakes can come in a variety of colors, including green, brown, black, yellow, red, and orange. Their coloration often helps them blend in with their surroundings for camouflage. Some snakes also have patterns like stripes or spots.
Depending on the order of the banding - either a king snake or a coral snake.
If the stripes are light in color, maybe even off white it could be a CA king snake.
A yellow snake skin typically has a smooth texture with scales that are usually small and overlapping. The color can vary from a bright, vibrant yellow to a more muted or golden hue. The patterns on a yellow snake skin can include stripes, blotches, or a combination of both, creating a unique and distinctive appearance.
Only in cases such as: The snake is blue, green, and yellow.
Garder-snake; multi color green, yellow and black stripes length of body.
if it is green it is mean, and when it is blue it only sees you. But when it is yellow it is just a little bit mellow.