Blog and Photos apps are integrated. You can easily select one or more photos in the Photos app, and instantly publish a new blog post with the selected photos. Here is a sample image from the Photos app:
You can even use Smarty code in the Blog posts, which allows you to embed dynamic sets of photos, e.g. tagged or top rated photos — such sets will be automatically updated when you manage photos tags and rating in the Photos app, without the need to update the blog post embedded code.