I set up a board just to pin humor things to make Dh laugh. Some of them are inappropriate/R-rated jokes, so it's a secret board. But he really enjoys it, and I enjoy scanning through all the stuff to find the really good stuff.
I love the ideas that I have found on there and done, from recipes to the marshmallow shooters and pregnancy announcement. I decorated my tree with coffee filter snowflakes (the snowflakes were the pinterest idea, decorating the tree with them was mine) and it was cheap, easy, and looked awesome! I'm going to be decorating my front yard with cheap but fun things for Halloween from ideas that I've pinned. There is some awesome information in the Science category, and lots of awesome Doctor Who/David Tennant pictures and quotes in the Geek section.
Pinterest is what YOU make of it; it doesn't make you.