Suggestions for a pasta salad dressing?

[seaglass]

I made a pasta salad last night with orzo, spinach, sun-dried tomatoes, chopped vidalia onions and feta cheese. Yum.

But not too thrilled about the dressing which was olive oil, vinegar and dry mustard. It was supposed to be red wine vinegar but I did not have enough so it was 1/2 balsamic, 1/4 red wine and 1/4 white wine. I would have gone all balsamic but I don't like the brownish color on pasta.

Any suggestions on a better dressing? I despise mayonnaise (except for in tuna and chicken salad) and that includes hatred of miracle whip. :-)