The fruit salad ends up being on the "rich" side because of the cream cheese and sugar:

2 lbs green seedless grapes
2 lbs red seedless grapes
8 ounces sour cream
8 ounces cream cheese, softened
1⁄2 cup granulated sugar
1 teaspoon vanilla extract, to taste

Wash and stem grapes.
Set aside.
Mix sour cream, cream cheese, white sugar and vanilla by hand until blended.
Stir grapes into mixture, and pour in large serving bowl.

Topping:
1 cup brown sugar, packed, to taste
1 cup crushed pecans, to taste
For topping: Combine brown sugar, and crushed pecans.
Sprinkle over top of grapes to cover completely.
Chill overnight.