I would do a 2" border all around in the deep purple color and then do a 3" top & bottom and 2" on the sides of the light blue/periwinkle. Then I'd do another 2" of the deep purple all the way around and a final border of a matching floral to make it the size you're shooting for. I always go bigger than what I plan to make sure it will cover the bed if I have enough fabric. If I don't, then I get creative and start piecing borders which is my least favorite way to do borders. Too much math--LOL!