You know, I recently did cross-hatch quilting lines on a wall hanging, and because I didn't have any painter's tape handy, I used disappearing ink to draw a line from one corner to the other (diagonally across my quilt, so that I ended up with a big X in the area where I wanted to do the cross-hatch quilting), sewed along those lines (very quickly, before the ink disappeared
), and then used the edge guide that came with my machine (a metal piece that extends out from the foot of my machine, and can be adjusted so that it follows the edge of the fabric when sewing a wide hem, etc.) to follow the lines I had already stitched, at 1 1/2" intervals (I also switched directions each time I sewed a line, so that my fabric didn't shift too much one direction or the other). It worked pretty slick, and saved me from having to run to the store for painter's tape
