I think pengrouponline.com might be of interest, which is run by a teacher, with several sub-blogs there under colorful icons. Also pinterest is not a blog in the sense of text entries, but some teachers there have pinned various resources they like, for example. www.pinterest.com/janetdyer/pins/.
Another great site is teacherspayteachers, which in spite of the name, has a lot of free resources developed by real teachers. But even if you pay for something, it goes to another teacher instead of a corporation, and you might want to load something of your own. I loaded a few student art in videos there and anybody is welcome to download them if they would help stimulate an art or science project (don't be put off by the "store" label as the files are free):