My problem with green/blue mats is that they smell. Go to Joann's and stand next to all the green mats and see if the odor bothers you. So I have a mat that is white. Can't remember the name off hand, but if you have issues with odor like I do, I'd avoid the colored mats. I know some people say they don't smell or it doesn't bother them. But I'd check it out just in case it might bother you.