Pinterest is similar to the Etsy Treasuries, but takes in the entire web instead of just one site. You make "boards" on different themes, then "pin" beautiful images involving that theme as you come across them online.
(Making sure first that you are pinning from an original source and giving the deserved credit to the creator of the item.)
When logged in to your Pinterest profile, you can go to a page that shows you others' pins. The page constantly changes as fresh pins are placed on top. Your page is personal to you, showing the latest images from what you are "following." You can follow just one board or you can follow a person and see everything she pins.
Click this button to follow me: