Wooden buckets for early farming. wood bucketing lava just deletes the bucket as if you tossed it in. (retexture iron bucket, use the wood bowl recipe but with a stick "handle" on top, add exception for using the bucket on lava)
Tool recycling. While mostly meant for wood tools that are used maybe 2-3 times and then end up largely useless but should work for all of them. place tool of any durability into crafting table and get 2 sticks.
Copper tools. Speed of iron, slightly less durable than iron, mines at stone tool level. (Copy stone tools, retexture and stat adjust, swap out recipes)
Copper (bronze?) armor. about the same protection as leather with maybe a tiny increase on the chest plate and pants, better durability.
Dog armor. Literally never bring my dog with due to high risk of death. this, but enchantable like a chestplate, would make them far more relevant. Dog with fire resistance armor doesn't die when falling into lava.
Dog whistle. Recalls owned sitting dogs to your location.
Horse charging damage. Horses moving at full speed deal half a heart of damage with fairly strong knockback. damage increases relative to level of horse armor. Optionally add weapon enchantments to horse armor.
Horse grazing healing. Horse eats a grass block like sheep do when standing still and hurt to heal half a heart of damage.
Goat mounts. Slow, but can climb sheer surfaces similar to a spider.