Choose a famous sentence and put each word in the white area between the windows. Then write down the meaning of each word. Or write down the front of the word.
Find a classmate who is skilled in painting, take out the picture of the teacher as a gardener and stick it on the white wall next to the blackboard (it is recommended to stick it on the corner with double-sided tape)
Ask the students to bring some books they don't need to read and put them on the bookshelf (front books)
Write some daily chores on the bulletin board (keep warm when it's cold, etc.) )
For example, do not use cardboard or foam paper. Cut into strips, which can be wavy or other shapes. (Too complicated shapes are unnecessary, such as heart-shaped, which is too difficult to make) Stick around window frames and blackboards, and light colors will not look too fancy.
Ask the students to take photos and post them on the bulletin board.
Ok, I have done it, but the overall color is still quite fancy. But it's too dark if it's all light.