Furniture 2D icon

Step 1

Create the 2D icon for the furniture

Replace myitems with your own namespace.

Now create the 2d_furniture.png file inside the folder contents\myitems\resourcepack\myitems\textures\item\

Step 2

Create the item which shows the placed furniture model. It is a different item form the one you see in the inventory (the one created in the step 1).

Now create the furniture.json file inside the folder dcontents\myitems\resourcepack\myitems\models\decoration\

Done!

Now try to right click with the 2d_furniture item and you will see it places the furniture model.