I just made some chicken salad today as a matter of fact, which I put grapes in, along with a lot of green onions and walnuts. Some mayo, dijon mustard, sugar, lemon juice, sea salt and black pepper finished it off. Normally I'm not crazy about grapes in my salad, but today I was totally craving them and walnuts in my chicken salad. I pretty much ate the whole container of it already, lol, so I guess that means it came out pretty good.
If I were to ever put sweet fruits in my salad, it would normally be mandarin oranges in an Asian themed salad, or on occasion strawberries in a spinach salad.