Anyone have any ideas on nice dressings for pasta salad?

ATM I just mix up around 1 cup of whole egg mayonnaise and 2 tsp white vinegar and use as much of that as I need to coat the pasta. Then I add in spring onions, corn, capsicum and cooked bacon.....yummo. Anyone got some alternatives to the dressing or indeed the actual pasta salad?! Just looking for some variations.....