This tentacle wall decal from StickerBrand makes a good argument for sharing your bathtub with cephalopods and their ilk. Available in an amazing range of colours, these bothria can attack any bathroom decor.
The decals are just peel-and-stick and are available in different sizes and removable (no-damage decor, ahoy!).
I think is the perfect decor for reading some H. P. Lovecraft in the tub. What do you think, Homies?