The simplest Double Slabs mod – which allows you to put half blocks (slabs) of different materials on top of each other, thereby getting a block of two different halves.
If you break such a block, then 2 plates will fall out, everything is simple, but it will allow you to make more interesting buildings.
How to install the mod:
Install all additional mods if specified.
Download mod and copy to .minecraft / mods
In the launcher, launch the version of the game with forge.