How can I build a wall inside my home?

I am trying properly decorate my house (almost 100% expanded), and I want to build walls to divide the rooms, but I can not find anything besides the blue brick pillars, which are a very different aesthetics than the rest of the place. 😭

I have a mod that allegedly gives me access to any item available in the game, so finding anything you suggest is no problem. 🖤

Does anybody have any idea how to make it look like there really is a wall between the rooms? Thank you. 🌱