Check this idea out:
I definitely think it was Saruman, and here's why: he was, of course, doing his thing, roaming the land and spying (remember, that was a known part of his character, and if I remember correctly, he didn't necessarily do it in "body"). BUT, Gandalf appears soon afterwards, as you recall, and though he doesn't reveal it, he is now The White (taking the role of Saruman), and perhaps the apparition of Saruman in grey shows his decline and "exchange" of color with Gandalf.
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"What if you slept, and what if in your sleep you dreamed, and what if, in your dream, you went to paradise and there plucked a beautiful flower...and what if when you awoke, you held that flower in your hand? Ah, what then?"
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