Something more exotic:

Tahini dressing: honey, tahini, olive pomace oil, lemon, water, salt

Sweet and sour "Asian dressing": lime juice, rice vinegar, coconut palm sugar, toasted sesame oil, light soy sauce (preferably tamari or shoyu) or another more simple version - kecap manis, toasted sesame oil, lime juice

Raspberry vinaigrette: raspberries, red wine vinegar, dijon mustard, extra virgin olive oil, salt, shallot

Apple vinaigrette: apple vinegar (strongest apple flavour I get from Korean double concentrated apple vinegar), linden honey, dijon mustard, salt, cracked black pepper, extra virgin olive oil (used to use EV rapeseed, but it's evil)

I know ratios would be useful, but I always make it by eye.