It's hard to get those kind of fragrances from Essential Oils...even with a bend, you probably aren't going to be able to replicate synthetic scents or food scents. Vanilla Absolute is exorbitant in price, and there's no way to know if the scent will make it through the saponification process (aka "lye monster"), but you could certainly try it! NDA carries some diluted blends of the costlier Absolutes and Essential Oils. I use the Jasmine and it definitely has a strong Jasmine scent, even though it is diluted in a carrier oil. Peru Balsam, while certainly different than Vanilla, can be used for a similar base note. Vanilla, Cinnamon, Clove, Mints, and Citrus scents can be blended for "food scents". Mints, Woods, and Florals can be blended for "water-beachy scents". The possibilities are endless...
Maybe search google for "Essential Oil Blend Recipes" and see where that leads you. Smell is so personal, that even if you find a recipe labeled "Tropical Island Nights", it may remind you of "Mountains & Meadows"...know what I mean?