The stamp is from Stampabilities and I purchased it at Hobby Lobby. A link: http://www.hobbylobby.com/Scrapbook-Paper-Crafts/Stamping/Rubber-Stamps/Octopus-Rubber-Stamp/p/156988
First, I put down a bunch of watercolor paint! Then I let it dry. I stamped an image of an octopus on top and then sprinkled clear embossing powder over top. I set it, waited a few minutes, and then lifted the water color up to have darker colors under the embossed images and lighter colors around it. The pictures just don't do justice to how awesome this came out!