I'm with the vote of thin grey,then red.I wanted to tell you that I really like your quilt. It was a "zen" look to it,and with it on point it adds more to the geometric look.I think it will be really lovely when it's completed.I must say too,that to have this piping as your first,quite a great job.I've bought pillows that the piping wasn't as good as this! Thanks for sharing.