Iron oxides yield pigments. Natural iron oxides pigments are called ochres. Many classic paint colors, such as raw and burnt siennas and umbers, are iron-oxide pigments. These pigments have been used in art since the earliest prehistoric art known, the cave paintings at Lascaux and nearby sites. Iron (III) oxide is typically used.–Wikipedia
There are many uses for oxides of iron. When I am driving across a bridge, I prefer the metal, if it’s thinking, to concentrate on its structural properties rather than reflecting on the value of rust.