Ibrahim Lancoln has shared a breakdown of the way he generates hand-painted tiling textures and PBR variations.
I used a tileable hand-painted texture workflow using Photoshop mixed with the standard PBR workflow principle in order to be flexible.
Instead of baking from a high poly mesh I painted the fake bakings such as the Ambient Occlusion.
Here is a short preview:
The full guide can be bought on Gumroad for €2.