Anything. Yesterday I told you how important it was to post often to your blog. Here's a couple of examples.
One advantage of my photo blog is that I'm always taking photos and thus have many opportunities to make posts to the blog. Even though "a picture is worth a thousand words," I don't think the search engines place as much value on images as they do on text. So I try to add descriptive text and a short story to each photo I post.
Did I say a couple of examples? You bet. One is this post itself. Talk about meta.