Stumble Cages (evade sweet berries, campfires, ext)

 Crafting 5 Iron Bars (reminder that 16 Bars come from just 6 Ingots) in a plus pattern [+], you get the
Stumble Cage, a sort of slab to go on top of blocks.
 However, unlike normal slabs, this one goes into the block below, caging it off.
This initial cage with no rotation exists for convienience, makes it easy to place multiple in a row (always places straight down, even when placing on an adjacent block instead of on top of the target block).

Cages can be placed in crafting to get the version that rotates. 
 Can add red, blue, or green dye to color the basic cage those colors.

Can scrap any of them at a stonecutter to get the 5 iron bars back.

I would like to learn how to do colors in a more efficent way before adding the rest, hoping to figure out how to do the same thing as leather armor, but I might compromise and do the same thing as dogs collars and sheeps wool. If nobody requests more colors, and I don't figure out the first way, it might never happen, I'm very satisfied with this as-is.