If you want to make a quick, dramatic change to your room, start with lighting.
I don’t know about your classroom, but my classroom has these bright fluorescent fixtures that suck the life out of you. I try to keep them off as much as possible. I don’t get enough natural light from my north-facing windows, so I augment with some spot lighting. The area lighting also creates some interesting zones.
The floor lamps create a spot to cozy up in the comfy padded chair with a book and a buddy.
A couple of desk lamps along the walls make for nice private areas for solo work.
My buddy next door, Mr. S teaches grade 4/5. He has been experimenting with lighting effects too. Check it out.
An arm lamp at the back by the sink creates a great, flexible workspace.
The floor lamp defines the mood of the carpeted reading area.
A couple of clamp lamps become instant wall sconces.
If you can’t change the wall positions or even the wall colours, lighting is an easier alternative.