Woo, hoo, way to go, @tekobo!
I've only experimented with various vinegars myself. I typically stick with rice vinegar, as it doesn't have a strong flavor on its own, like apple cider vinegar does. White balsamic is a nice one.
Fruits can work well in sauce, like mango, pineapple or raspberries. Tomatoes or carrots can work, too.
Spices can push the sauce in many directions. Southwest/Mexican (chili powder and cumin). Middle Eastern (ras El hanout, berebere) Indian with all the different curries. Asian with ginger , fish sauce (?), miso.
You have a base sauce that you can experiment with, so have some fun with it and find what you like.