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I need to randomly apply a little hue variation on a texture (not to a color) in order to, creating multiple instances of an object, have every instances with a random hue applied on.
A classic example could be a random foliage texture hue of instanced trees.

I know about the use of a gradient and random color node, but I need not to add color on a texture or similar, but simply to slightly move the Hue of a texture from, as example, +0,02 and -0,02, in order to have slighly variations.

Hi Luca,
you need to use the Octane Gradient node in Complex mode, with Random Color node as Texture, and some Color Correction nodes connected to the desired color, and with different Hue values, connected to the Gradient, and applied to a Render Instance object: ciao Beppe

Thaaanks a lot! It works well.
Only five years to delay for me to understand how to use gradients and random color....