There are many synonyms for the term "alternation of colours" that one can use to describe a pattern or sequence of colours. Some of the most common synonyms include "color rotation," "color shift," "color variation," and "color change." Other similar terms that can be used to describe the same idea include "hue alteration," "color progression," "multi-colored pattern," and "rainbow sequence." Whatever term one uses to describe the alternation of colours, it is clear that it is a powerful tool for creating visually interesting compositions and can be used in a wide variety of artistic applications.