For me, as a display designer, the use of any more than two or three colours in a sequence can begin to look messy. I generally keep it simple – silvers with reds, golds with blues, greens with violets. Of course, sometimes multicolour sequences can’t be avoided and they do have a place – for example in the pre-finale “bouquet” of a display where much of the impact is determined by the intensity of the firing rate rather than the balance of colour combinations. But more than one or two “mixed sequences” within a show is enough in my opinion!