Yes, you can add fillings such as raisins, nuts, custard, chocolate chips, nutella, cheese, fruit jam/compote, spicy potatoes (samosa filling), caremalized onions and sauteed vegetables (puff filling), spiced paneer, etc., before shaping the dough into wool rolls/balls. You can top the bread with cinnamon sugar, sesame seeds, sliced nuts, salt flakes, etc. After the wool roll bread is baked and cooled you can drizzle with vanilla glaze, chocolate ganache, honey/maple butter, herbed butter, etc.