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Not necessarily. They might be blue, green, or essentially white depending on how many waters of hydration are associated with the copper (II) ion. It's very easy to see this if you just take some copper (II) sulfate pentahydrate (blue vitriol) in a test tube and heat it; as the waters of hydration are driven off, the crystals turn white (some people call it a very light green; it looks white to me). When the crystals are allowed to cool they will absorb water from the air and eventually turn blue again. Aqueous solutions of copper (II) compounds are blue, as far as I know; at least I can't think of any counterexamples.

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