Hey, I have few ideas for the game and I hope you guys will like it!
SEA UPDATE IDEAS
Bernard The Polar
Bernard is a veteran one handed polar bear. He usually could be find near of edge of the sea while he sits on his iceberg and fishing all day. He sleeps on winters. He could not be attacked or killed (like pig king) and have funny quotes like "I'm glad polars are left handed".
When players give any ocean fish to him, he will throw a icecube to boat. (Will not cause damage)
Ice cube will be carryable and breakable with pickaxe. When players break it, it will give few ices (I think amount should be 1-5) and a random item (like gnome), seeds, fruit or nothing. Basically it's a tumbleweed but have higher chance to drop goodies.
Prison Islands
Now few one-tile island will be generated in the sea. They will have a coconut tree, a treasure and a bone. If you think "X" treasure is so much pirate style, stuffs could be on ground or in a chest.
SWAMP UPDATE IDEAS
New Waters
Now a lake will be generated in the swamp. It will have darker colour and stick/grass swimming on it. Also it will have fog effects and little plants around.
Rice and Shine
Rice is a new plant that's swimming in water and could not be plant anywhere else (Like reeds). Players could make new food recipes with it. It's grows in 3-4 days and have not rot meter until be cooked. Also have mosquitos around it.
Magic Of The Swamp Creature
This mud monsters are usually sleeps in lake but when they feel any player-caused vibration on lake (like rowing boats), they wake up from their sleep and try to destroy vibration source. They are gonna hit your boat until kill it or be killed. When thett be killed they are gonna drop kelp, sticks and swamp mud.
Swamp mud have perfect nutrition levels for farm plants. It's magic of nature!
The BloodSucker
This monsters are small death machines, they are really small and their colours make them hard to find. They are just waiting in sea and when they taste blood of any creature on air (Players have lesser health than %100), they are gonna jump on players and will be equiped on tool, helmet or chest slot. They will stay on it and suck players health until players realizes and unequip it. They are gonna die when be unequip. So players could eat it and gain health (while lost sanity) or basically use it as fish bait. Disgusting but useful.
Frog Prince
I love lily pads, who doesn't? Swamp will have lilypads and lilypads will have crown flower on it. This flower will be a great exotic drink on crackpot that called Princ El'zââ. But...
Sometimes it's not that easy to having a crown. Lilypads have a chance to have a frog under it. If players get attacked by frog Prince, they have a chance to turn a frog for few seconds. Is it worth to for that drink, it's your decision.
That was all, thanks for reading. Please share your feedbacks and I hope I could give inspiration to Klei. I would be happy to see things like those in game.