I put a tbsp or 2 into my regular vinaigrette recipe depending on the other salad ingredients involved. Olive oil, lemon, salt & pepper, shallot, mayo. Or sub vinegar for lemon. Sub onion for shallot. Add a dollop of sour cream or creme fraiche. Add in herbs of your choosing.
also look into Green Goddess dressing (swoon!) so good.
Mayo is also fabulous for dips of all kinds :-> and garlicky aioli.