As BDL suggests, any number of salad dressings will work, a chunky bleu cheese is one of my favorites. You did say grilled, maybe a vinegar and mustard based barbecue sauce, or your favorite 'dressed up' catsup for that matter.
The classic hot parmesan, mayo and artichoke.
Roasted garlic hummus style dip.
Marinara. One thing I didn't do this summer was smoke any tomatoes. Smoked tomatoes can produce some interesting sauces.
You might be surprised at how many sauces can benefit from the addition of a bit of anchovy. When well incorporated, no one realizes they are eating anchovies, they just know it tastes better than the usual stuff.
Consider curries.
mjb.