You don't even have to buy the 'large floral' print. Just use it to see the color combos. If it is very pleasing to your eye, then those colors are probably going to go together (there can be the odd weird fabric). Take an afternoon and go audition fabric at the store. You will find that the more you do it, the easier it will become. If you have a smaller quilt shop in your area, the folks there should be able to help you.