Yes, you can get great blogging ideas by setting up a Google Alert. If you Google-Google Alerts you will find an easy way to specify a topic you want to get notifications about in your email. For example, if you love pet rocks then every time pet rocks are mentioned online you will get an alert. Now those alerts can be “as it happens”, daily, weekly or monthly.
If you find a blog post you like you can post it on your site or refer to it. You can make your own comments and if you use their permalink a trackback will be sent to them. So now you have created a blog post.
Try it. If you want me to post a video or tutorial let me know.