This simple command will make you mini blocks.

Paste this into a command block:

summon ArmorStand ~ ~-1 ~ {CustomName:block,NoGravity:1,NoAI:1,Invisible:1,DisabledSlots:2039552,Equipment:[{},{},{},{},{id:blockid,Damage:0}]}

Now change blockid to your block id and 0 to your damage value (if required)

There are your mini blocks.

To remove the blocks, stand near the block and execute this command.
/kill @e[r=2,type=ArmorStand,name=block]

To make the blocks smaller, use this command instead.
summon ArmorStand ~ ~0.1 ~ {CustomName:block,NoGravity:1,NoAI:1,Invisible:1,DisabledSlots:2039552,Equipment:[{},{},{},{},{id:dirt}],Small:1}

You can use most blocks (works with dead bushes!), but items don't seem to work.

I hope you enjoyed this simple tutorial. If so, please leave a comment down below.