The first step is the design, make sure to factor in the various heights of thing you want it to hold, and ensure it is strong enough to do so.
Add a bit of flair, and give it a nice expression, remember to leave space for the speech bubble.
Step 4: Complimentary Bathroom Octopus
Put in the speech bubble and write up a good compliment, I like a good pun wherever possible.
Job done, the bathroom octopus has been a great success!