Ancient books with simple and generous cover colors

I think a Dream of Red Mansions-Red, Water Margin-Green, Journey to the West-Yellow (in the TV series Journey to the West, many Buddhist immortals such as the Monkey King and Tathagata are all dressed in yellow, and the whole story is yellow, and the feeling of traveling westward-dusk). Romance of the Three Kingdoms-Deep Blue (the deep and grand sense of vicissitudes)