Here is a photo of what I’ve got so far. I haven’t done a hem yet, because I’m really waffling on that. I’ve simply done a provisional cast-on in white (which you can’t see in the pic) and will decide about a hem later. At the base of the picture it’s three strands of 5 Blue Purple, going on up through 10 Blue Purple, 5 Purple, and now I’m on 10 Purple. (Right now I’m on one strand of 10 Purple and still two strands of 5 Purple). It’s hard to see the color change that’s on the needle, but you can get an idea of how using multiple strands to swap out colors makes a gentler color gradation.
This basic pattern is so useful. I’ve already got an idea to buy Lunatic Fringe’s "Grey Matter" kit and knit the same sweater with one strand of 5 Red and two strands of black at the hem, keeping the 5 Red throughout, and swapping out strands of the grey matter colors so that it shades from full black at the hem to white (with 5 Red) at the neckline. Or many other options! This is going to keep me going for a long time.