This is my tackle box for adding details to my builds.
Its a structure block (azchestrun.nbt) that I can load over whatever I am building

In Minecraft if you Scroll Click (mouse wheel click) a block it will copy that block to your inventory.
If you CTRL + Scroll Click a block it will copy that block and its properties
e.g.
a sign and the sign test
a custom player head and you get the custom player head (not just "player head")
a structure block and its data
a command block and its data
a banner and its pattern

So I collected all my favorite
player heads https://minecraft-heads.com/
custom positioned armor stands https://haselkern.com/Minecraft-ArmorStand/
other custom mobs, blocks, armor stand detailcraft, super enchanted items, etc. https://mcstacker.net/
special blocks like light, barrier, structure void, debug stick
or particle effects