1. A book with a red cover.

2. A book with an orange cover.

3. A book with a yellow cover.

4. A book with a green cover.

5. A book with a blue cover.

6. A book with an indigo cover.

7. A book with a violet cover.

8. A book with a pink cover.

9. A book with a white cover.

10. A book with a black cover.