I made this for a friend's baby shower using super bulky yarn and a 10mm hook for the base and the seaweed and worsted weight yarn with a 5mm hook for the octopus. I had an idea of what I wanted, so I just went for it. I am pleased with the results; though, if I had to do it over, I would have added some bubbles.
I used the application of the pieces to the base to better define curves in the tentacles and seaweed. I was careful to sew through the stitches, so the back is solid blue.