I would guess sour cream or creme fraiche (less tangy), or even buttermilk.

As for the mascarpone, oh ho, so much you can do.

A good one for that amount might be to make some polenta or grits and stir it in at the end. That makes a delicious side for which to pile on vegetables.
I'm assuming you don't want to do a tart, but it's always great slightly sweetened and flavored with either zest or coffee, vanilla, etc., whipped with some cream, and put into a tart shell with some fruit to finish.
A creamy pasta.
Stirred into risotto.
Topping for baked/grilled fruit
Mac and cheese

http://www.seriouseats.com/recipes/2...er-recipe.html
Originally Posted by Saria
Ooooo! Grits! Risotto! Mac and Cheese! These are all making me very excited (clearly). I just had "Shrimp and Grits" out at one of our fav local places. Those were delish. That's definitely something I might try at home.

I'd love to do a tart, but I'll have to save that for when we have some people over so I don't eat the whole thing myself.

We get our CSA goodies today, so I will try to remember to take pics and report back on our loot when I get home tonight.