As soon as I read about Amortentia in HBP I immediately thought of athelas.
However, there are some differences. First of all, HP states the personalized scent outright; in Tolkien it's only very lightly implied. Then there's the fact that athelas seems to correspond to who's supposed to be healed, not who's smelling it. And finally, presumably Amortentia would have considerable romantic elements to its scent.
For me (after a day's long thought), I'm going to have to go with the smell of sunshine, grass, and dirt, tinged with the faint whiff of freshly-laden sunscreen.
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