It depends on the snake. They can be blue, to brown, to black, to red. They can be solid or have very complex patterns. You should post a more specific question if you're asking about a certain type of snake.
That is entirely dependent on which kind of snake it is.
black with silver spots
No idea! ermm... a snake.
That is the endangered Georgia Tube snake.
Are you saying that the snake has like a "hood" around the head? If so, that is a cobra.
You need to provide more detail to get an accurate answer. Where is the snake found? (Its location and natural habitat) Is it all black with just a blue stripe? Does it have any other markings?
An Aussie snake
there could be. Kingsnakes and milk snakes can have very similar markings to the coral snake. A true coral snake's habitat is in the southern region of the US. if there is any doubt...stay away.
The gray rat snake can have such markings, and even the common black rat snake can show gray bands when distended.
Snakes with general black and tan markings are most than likely Common garter snakes. These can include the red-sided garter or eastern garter snake. Common garter snakes can grow to anywhere from 48 to 54 inches.
Corn snakes vary from a light tannish yellow to a dark russet red in markings. The base color is the lighter color, and the darker markings are segmented up their body. See the related link for images.
Garder-snake; multi color green, yellow and black stripes length of body.
pythons have markings but the python is to hairy for any 1 to c the markings
the same color of a Lepord