Here's a picture of the ocean that I took on a vacation to Destin, Florida.
Salt Water: I do not live super close to the sea, and the sea I live most near is not very clear, so I mix my own with sea salt and water.
Plants: I use a lot of plants that are commonly used in witchcraft (lavender, rosemary, chamomile, etc.) (Just to be clear, I NEVER use white sage; it is our responsiblity as witches to respect closed practices.) I also use a variety of seaweeds and algeas.
Sea Salt: I always use sea salt in place of regular salt in my practice.
Seashells: I use seashells that I have collected over the years (I am a big shell fanatic) in my practice. Obviously, only take empty shells and try to limit how many shells you take. I use different shells for different intentions. One unique thing about one of the ways I use shells is by using a mixture of shells with feminine, masculine, and androgenous associations. I love slipper snails for their associations with androgeny. I also use shells for beauty, protection, etc.
Crystals: I don't have a ton of crystals, but I do tend to use them in spell jars and such. I particularly like to work with crystals that are connected to the sea or moon. Two of my favorite crystals are larimar and moonstone. While not a crystal, I also love to use sea glass.
Octopedes (and cephlapods in general) survive via their intelligence, not a shell like other mollusks (although the nautalius has a shell too). So, they evolved higher intelligence. Without going too much into my personal story, I relate a lot to this. Survival strategies can cross species barriers I suppose.
Octopedes are my favorite cephlapods. To me, they represent intelligence, curiousty, wit, thinking outside of the box, finding alternate solutions, etc.
This is why they are the animal that I use as a symbol/sigil most often. I use the image of an octopus when I want to invoke these traits.
Once again, respecting closed practices is very important to me. I do not beleive that octopedes are a spirit animal or animal guide for me, as I am not a part of those closed practices. They are simply important to me. I use them more like a deity or symbol of the ocean than anything else.
I am just starting to worship dieties. I'm still not completely sure if I think of them more like spirits or what, but these are the ones I honor most in my practice.
Athena
Hestia
Freya
Aphrodite