[ ] When a chicken is on your head you gain slow fall. (Maybe even allow the player to manually pick up and drop chickens? Though this conflicts with current effects.)
[ ] (Conflicts with current effects) If a player damages a chicken there's a mild chance more chickens will spawn.
[ ] (Conflicts with current effects) Chickens can now attack players in retaliation to taking damage.
[ ] When a player leaves the server they are returned to their spawn point.
[ ] When a player dies of old age, a random player is given a wooden sword and a shield.
[ ] Lanterns can be used like a flint and steel. Can be placed by crouching.
[ ] Lanterns can be worn on the pants slot to light up the environment around you.
[ ] Wearing any combination of blue leather armor, diamond armor, or any armor with a blue trim will give you conduit power.
[ ] Wearing any combination of red leather armor, iron armor, or any armor with a red trim will give you fire resistance.
[ ] Wearing any combination of green leather armor or any armor with a green trim will give you Hero of the Village.
Various Zelda themed suggestions: