Have you an idea of what you will be doing with the selvedges? Check out some 'selvedge' tutorials on line and perhaps sew a test piece to see what effect you prefer.
Do you only want to see the white selvedge part or do you want a strip of coloured fabric between each selvedge? As the selvedges are overlapped, rather than seamed, you don't lose very much when they are sewn together. I would love to hear what others do.