Good writers read — a lot. Read other blogs, read the news, read things that interest you and books you love. Remember that you can respond to these things. Some of the best posts are spawned this way.
Did you read something on Mashable that you completely disagree with or something on the Havahart Blog that got you thinking about the issue of animal cruelty? Write about it! You can even comment on the original post, mentioning your response. Maybe you’ll even gain some new readers this way.