As a designer I find Pinterest a very useful tool. There are many points of view concerning this social media platform but personally I think it's a great resource and has helped me tremendously. I use my boards to collect imagery for my new projects, things that inspire me from home décor to patterns. I can also upload my own photographs and designs too.
At the beginning of every project I like to record my train of thought through photography & drawings before manipulating the final design in photoshop. I can use pins to upload my own imagery to my private boards and view them in one place. Another very good thing I have found with Pinterest is the amount of traffic that comes to my blog through the images I have pinned.