How to Add on hallway portion wall?

Build it in brick with an arch or Stud partition and brick slips or wallpaper oe timber panel it and add a door too. Or partition it off with a large piece of furniture or a Screen or a Room divider or a Curtain etc..........

Do some searches on "This Old House" website. They have ideas and instructions.

https://www.pinterest.com/pin/12244230211036826/

https://www.youtube.com/watch?v=uZHcWUU-FbQ

Lots of photos here. Clock on a photo and go to the site.

https://www.google.com/search?q=build+a+hallway+or+partition+wall+that+adds+some+characteristics+to+my+home&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi75Z2qjbLXAhVB1oMKHXTpDOIQ_AUICygC&biw=1016&bih=642

I built a plant wall. I took 1x1's and made three open boxes. I tiered them down from the tallest at the wall, medium, short. Painted them the color of the wall and had plastic cut to fit the top. Put low light loving plants inside each tier in pots I painted the color of the wall and put a lamp on the tallest one for additional light for the plants. Gave me just enough division without feeling blocked in and some green that I love in my house.