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Cook pasta until it is al dente. Drain and rinse under cold water. Pat dry. Set aside.
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Combine feta, buttermilk, mayonnaise, lemon zest and juice, salt, garlic and black pepper. Mix to combine. The feta gives this dressing texture. If you want a smoother dressing, blend the mixture. You can add more mayonnaise at this point if you want a thicker dressing. Set aside.
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Combine cooked pasta in a serving bowl with buttermilk dressing, fresh herbs (save some out for the garnish), celery, tomatoes, and red onion and toss well. I you use fresh dill in this recipe (and I think you should), be sure to chop it finely and remove any large stems.
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Chill the salad overnight in the refrigerator.
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Garnish with sunflower seeds and sprigs of fresh herbs before serving.