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How can I make a grainy/noisy looking material in Blender Cycles? I want to have a node set up where I can create a grainy material of my choice of color, with a noise variable so that I change the level of grain shown.

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Use a noise texture. You can change the scale and detail. Hooking it up to a Color Ramp (or curve, or gamma or Bright/Contrast) node will allow you to set the contrast enter image description here

You can set the color directly.

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Or use the texture to control the mix of other colors.

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Or different shaders.

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Or you can use it to combine with other textures and types of noise, as described in this answer: How do I make a Decal look worn?

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