I use a medium gray almost exclusively to piece with- but others use colors or white/tan and love theirs just as much! I would suggest that you hold off on the quilting thread color until you are finished piecing. Keep the quilt in mind-not the wedding colors. In 20 yrs, no one but the bride will remember the wedding colors, but if you quilt it in navy blue (dark colors on light fabrics show wobbles-ask me how I know!), the wobbles will still be there! Let your piecing shine and use a thread that will show the quilting but not take the limelight. Just my humble opinion!