Using various colours in a classroom reduces passivity and boredom. So your classroom should incorporate a variety of colours to reduce monotony and visually invigorate learners. Consider the age and gender of your learners, as well as the subject and activity, when selecting the colours.
Neurobics encourages us to use as many senses as possible to create strong and multiple associations, therefore when we remember the information there are more links. When we need to recall the information we have many associations to draw on and therefore better memory recall.