At one point, Skye, Zowie, and I had eight cats living in our home. Six belonged to us, and two were the bestests. Too many cats, for the space we had. But we loved them all! When you can't think of what to write about, look to your pets. Or other animals in the area.
Many people like to write for a cause. Perhaps you're a foodie who wants to help people with little money to eat healthier. Maybe you blog about animal rights. Or perhaps you want to write about environmental concerns.