I found I could create boards of things I thought were interesting or useful to use in the EAL classroom. I also found I could look for resources online and it would take me to a really useful website, which would help me out.
My favourite use for Pinterest though is finding funny images and memes to use with my students. As a warm-up activity I will often have a photo displayed on the board as the students come in. I either ask them to talk to their partner about the image or write a short paragraph about the image, depending on their level. It's a really good warm-up activity to use and the students love the images.
As a website Pinterest is very low-maintencne to keep on top of, and its something you can flick through while travelling home on the train or bus or while sitting in front of the TV at night.
You can follow me on Pinterest to see some of my boards, found here: @gemmaealteacher