Absolutely! While hazelnut filling provides a delightful taste, you can easily customize it to suit your preferences. For example, you could swap ground hazelnuts for other nuts like almonds or walnuts, adjusting the sweetness by using chocolate or fruit preserves as fillings instead. Additionally, for a spiced option, consider adding cinnamon or cardamom to the filling, enhancing the flavor profile further. If you're looking for a touch of fruitiness, try mixing in some finely chopped dried fruits such as apricots or figs alongside the hazelnuts. The versatility of brioche rolls allows you to experiment with various fillers, ensuring every batch can offer a new and exciting taste experience!