Welcome back!   :)

I'd say that rather than try to invent a suitable rust texture from scratch -
because I know how hard that is to do - search for rust textures in the
newsgroups and use those as a starting point for customizing your own.

A fast way to evaluate a lot of variations would be to make a grid of spheres or
boxes with a nested loop, and vary some parameter of the texture from start to
finish.

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