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Step 1
Hang seaweed streamers from the ceiling. You can just use crepe paper, or cut out the shape of actual sea weed species.
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Step 2
Hang fish cutouts from the ceiling. Print pictures off the internet. Print a mirror image, then cut them both out and glue them back to back with some stiff glue, or just cut the shapes out of stiff paper and hang.
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Step 3
Make jellyfish. Find inexpensive clear plastic bowls or Slurpee cup lids and glue plastic streamers to the edge.
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Step 4
Use centerpieces that look like coral, shells or sunken ships.
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Step 5
Use a blue filter over the lights. Dim the lights slightly.
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Step 6
Use bubbles. For an outside party you can use a bubble machine. For an indoor party, you can use lots of blue balloons.
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Step 7
Decorate the door to look like a shark's mouth. Decorate a window to look like portholes on a submarine.
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Step 8
Hang a rubber boat from the ceiling. Hang a fishing line over the side with bait on the end.
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Step 9
Use fish nets. Drape a wall or two with them, or use them as table cloths.
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Step 10
Get a special effects light that projects simulated water onto the ceiling.
