I used to go to a restaurant that seemed to use tahini in everythings from salad dressing, to sauces, to soups. (for a time, I couldn't stand the stuff anymore!).
Previously, I used to make a spread mixing about equal parts of tahini and miso (the creamy/fatty tahini and the salty miso tastes blended together very nicely). BUT, this was back in the days when I didn't pay attention to fat or calories, and it's a very high calorie spread (especially if you use it on sesame crackers, like I did!). I suppose you could modify it by thining with water to make a salad dressing? Or mixing with some blended white beans to make a dip?