Hi Synnove, I've been in this situation too, where I'm quilting with diagonal lines and really don't want to do the horizontal perpendicular lines but worry about spacing. I just don't like the boxy quilting line look. One option that has worked better for me is to do the cross lines not 90 degrees, but 60 or another angle, so the quilt pattern looks more like diamonds. I agree with others that you want some cross lines in there, or have the lines closer together for durability. Also -- in the end the quilt lines won't be as noticable as you think if you use a blending color thread. You want this quilt to last for years!