Although I've heard some get addicted, I find Pinterest a quick sojourner that refreshes my mental state for writing. Pinterest is like a shoe box where I collect odd things that interest me. It accommodates some of my quirky interests, like Great American Tacky, Slightly Ill Humor, or surfing.
For example, I think villains are a key element of storytelling. Heroics can be uplifting, but heroes need someone or something to fight against. Nasty villains, allow heroes to be heroic.
If you'd like, you can check out my rogues gallery on Pinterest by clicking over to Bad to the Bone.