I would prefer to stone the interior walls of Hogwarts but that would b expensive and take to long. As an alternative I'm using stucco paper. I found this roll of wallpaper at Lowes home improvement store. It adds texture to the castle walls (instead of stone) and I paint it exactly the same colors and technique as the castle stone.
I'm a maker and a thinker. I live in a magical world inside my head. To some, I am an artist. I am surely creative. And my creations change as quickly as my mood - so you never know what you're going to get.