I wouldn't necessarily plan your wedding around the season unless that's what you and your fiance wanted it to be. I believe that if you have a vision and idea of what you'd like your wedding to be then follow that path. If it happens to incorporate fall colors or winter white - go with it and make it fun. Most importantly make it yours! I second Sarahdactyl and say do what colors/patterns that you like! If you like it.... your guests will LOVE it!