Block/Item suggestions.

Wiring (vertically capable redstone) holds a full 15 restone charge, and can be colored with wool, which means that you could have 2 different colors of wire next to each other, and they will not interact with each other. 3 copper nuggets, 3 redstone and 3 wool (any color). Steel crafting. Must use blast furnace, adding coal block to iron block creates steel. Mid range between diamond and iron. (In blast furnace, 1 coal block fuel with 1 iron block = 2-6 steel ingot chance.) Additionally, Slag "unusable" left over iron is created proportional to the amount of steel created, must be harvested with a pickaxe and can be used in "junk" items. Re-plantable Azaleas. Redstone/Wired Portals. A transversal item. Crafted from an Observer, a Lodestone and 6 Crying Obsidian and an Eye of Ender . It must be connected via redstone/wiring and can teleport players over long distances. It can also be set up with many portals connected to a Hub Portal. It can also function like a Lodestone when activated with a compass, except when the compass is used, it can teleport you to the portal it is connected with, as long as you have an Eye of Ender.