This is a card I made a few weeks back after seeing some nautical cards on the Simon Says Stamp blog hop. (You can see the cards here, they're the second and third one down.)
I used markers to ink up the stamp (by Local King Rubber Stamps), and cut it out. The lines are just blue cardstock placed over white. The sentiment is from my mermaid Some Odd Girl set. I used pop dots to add the octopus to the card. I like the card, but I'm not sure what occasion I'd give it out for. Maybe a play/performance? (based on the sentiment).