Althouse said this about hers:
Mine smelled like: 1. lemonade, watermelon, and chicken & dumplings, and 2. knitting wool and African violets.
And I popped into the comments to say this about my own grandmother, the one that lived long enough for me to remember clearly:
Pencils. The newly-sharpened pencils she would give me to draw with when I came to visit.
I love the smell of pencils.