For each of the dressings simply combine all the ingredients in a small mixing bowl and whisk until well combined.
The creamy dressing will yield 1 cup. The two oil-based dressings will yield about 3/4 a cup. For all three dressings, the amount works well with about 8-10 ounces cooked pasta plus whatever mix-in ingredients you choose. But some like more or less dressing on their pasta salad, so this is just my suggestion for serving (the way I like it!).