I love Pinterest!
I honestly love Pinterest and use it to just kind of start my though process when I want to make or create something not only for lessons. I think it is a great resource but I would not necessarily have my students use it. I would also suggest testing some of the ideas you find on Pinterest before you do them in your own classroom.
How I Use It
I probably would not have my students use Pinterest. I would use Pinterest to help inspire a lesson but I would not use another teacher's exact lesson. There are so many ideas out there and I think Pinterest is a great way for teachers to share their DIY ideas for the classroom as well as get ideas for their own lessons.