The boundary you mentioned is in many books, but you should try something new.
I can only give you some advice. Don't design a place in isolation, design it as a whole. For example, you should first determine the basic color of the whole environment.
For example, if you use pink, then your whole classroom should be dominated by pink with some soft clothes.
Therefore, it is not necessary to have the latest border, the most important thing is to coordinate with the whole environment! Unity of style and feeling
Even the simplest boundaries such as curves and circles.
As long as the style, texture and tone are unified.
It will look very comfortable ~!