So I went through the stickies and while most ideas were already taken (curses!) some have not been, or my idea is a modification of it.
farm fences- now i know that this has been suggested, however for this idea, its different. what a farm fence would be is a well, fence, but with a twist. sheep, cows, and pigs who are within these fences will not despawn if you go far away, and cannot leave the fenced area.
in addition to this (possibly) livestock would respawn after a certain amount of time. fences cannot be built upon, and can only be built on dirt.
another idea is a garden fence. this is much like the farm fence except that sheep, pigs and cows will not enter this area and have a party all over your crops >.<
Berries: ok, i know this one has been done, but I'd like to perhaps use this in combination of a few ideas.
first of all, they would be growable, you could plant a berry and it would grow. for looks, they would appear to be like a leaf texture except with a few larger dots on them colored for which berry they represent, much like ores.
the berries would come in a few colors, red, blue, green, and yellow. and would be edible for health and powerups.
blue berries- faster swim speed and longer breath duration as well as healed for +1 hp
green berries- anything you plant will grow faster, and better crop yields as well as healed for +1hp
red berries- damage resistance equal to +2 armor as well as healed for +2hp
these would be only temporary buffs, and you could only use one at a time., and there would be a cooldown for using these, and the buffs would be non stackable.
in addition to this, they could also be used for dyes and combined to make dyes, for example, you could take a blue berry and a red berry to make a purple dye. or, you could use 1 red berry and 2 blue berries for violet dye.
also, would like to add that Zoythrus is the one who posted the idea for powerups before me (lucky charms), and that ibeatyou9 posted the idea of berries/dyes before me.