Opinions are gold mines for writers. If you're stuck in your writing practice, just think of something that you love (or something that deeply irritates you). Write the merits (or pitfalls) and then keep going. How long can you stay on this topic? What are the roots of your thoughts? And while we're at it, what else do you have to say? You might find that once you get going, your words take you in all kinds of unexpected directions.