Idea from ThaumicTom.
These are custom blocks. Place them in your blocks folder.
In-game, they can be found in block folders: 5-7-1-1 5-8-1-1 5-8-2-1
6-7-1-1 6-8-1-1 6-8-2-1
7-7-1-1 7-8-1-1 7-8-2-1
8-7-1-1 8-8-1-1 8-8-2-1