jasmine, fresh linen, cherry blossom, the smell of sunlight on skin and hair, chamomile blossoms, the smell of freshly fallen snow, the smell of thunderstorms. Or storms in general.
And more recently, sandalwood. I actually used to not really be a huge fan of sandalwood, but my boyfriend's shampoo has some sandalwoody notes and it has apparently rewired my brain. Ex boyfriend I guess actually. π Still not really used to calling him that.