Beat eggs until light; add sugar a little at a time and beat thoroughly. Add melted butter and anise oil; add flour and baking powder. Roll out 1/4 inch thick; apply design with design rolling pin or design blocks. Cut apart and put on greased cookie sheet. Let stand overnight at cool or room temperature. Bake at 350 degrees for 10 to 15 minutes until brown on bottom. Design can also be painted with food coloring, using toothpick.