I made this pattern for my mom using her favorite colors pink and green which were the colors she had for her wedding too. I use half green and half pink of different fabrics, and different hues.shades of each, but I don't think you have to use different ones, depending on the size of the quilt you may want to use 2 or 3 repeats of a fabric. The larger the quilt the more number of fqs, and you could just get some yardage and cut from that too. If the couple are still in the same town as you why not have them help in selection of fabric?