How can I effectively use this tileset?

[Coldfingaz]

http://i409.photobucket.com/albums/pp17 ... School.png

All the autotiles that I have will not go well with this. How am I supposed to make walls inside? Since it is indoor, I need to have those black space by the side. That isn't a problem but wouldn't it be weird if it does not have any walls by the side?. An example on how to use this would be great!

 

[Ellie]

By the looks of it there should be an autotile to go with it, for the walls.