I got the yellow Omnigrid rulers, then went to the green before I realized how hard it was to see the fabric. Noticed that even though the green and yellow were visible to the eye, I still struggled with viewing the fabric. I picked up a Creative Grids ruler at a LQS and liked it. So I began replacing the Omnigrids with Creative Grids, I can easily see the fabric and have less mistakes in cutting. I also like their accuracy, too.