Nutmeg (or perhaps mace) is a spice you're probably most familiar with from baking or cooking, powdered. Perhaps you've seen the whole spice in a grinder at a coffee shop. The scent is warm and spicy, perhaps a comforting reminder of holidays past.
When creating a perfume, it's best to have at hand several spices, so you can choose the one best suited. Cinnamon, clove, cardamom, and all spice...you'll feel like you're in a bakery, or perhaps preparing the perfect chai.
While nutmeg essential oil is more easily found, for perfumery you should seek out the absolute. The scent is finer and richer, and will provide a warm middle note. The essential oil may work for aromatherapy purposes, but for perfumery, the absolute provides more depth and smoothness. Blend a small bit with jasmine or in a floral blend. Use it in an Oriental fragrance, or in any fragrance in need of some warm spice.
All Spice (Pimento Berry)