I love my square revolving cutting mat. I cut a lot of small pieces for scrap quilts and crazy quilts. The revolving mat makes life so much easier for me.
Someone else mentioned the light that you stick on the side of your machine, and I have one too. This is as important to me as the mat, maybe more so. Before I got it I could never see well enough. The light on my Janome 760 is very poor. This little lamp solved the problem big time! 8-)