Pattern? There is such a thing? Just kidding. I've found that drawing out a pattern just causes the universe to laugh hysterically. I usually end up with something that has no relation at all to what I thought I was going to work on. And normally the newly inspired design is much more creative than what I'd planned.
Last night was an example. I started a plan using pink and an interesting peachy color...hahaha what I finished with was a 2 strand lapis and amethyst twist that is stunning.
Many years ago I designed clothes, and would draw out a design at night. The next day when I started working, the fabric took over and always became something completely different. I found it best to let the materials tell you what they want...Michaelangelo said basically that inside each stone was a statue waiting to be let loose (paraphrased)