This way you can determine if you like the fabrics together before you purchase them. This is particularly useful when you find fabrics that are not part of a set of companion fabrics.
I am considering remaking my DearMYRTLE quilt banner, though a bit smaller than the 8x2 foot one I use in my design studio. Right now I've decided to eliminate the pink fabric in the upper right, because I I just don't like the tone.
I also ran across the cute multi-colored random dots fabric in the lower right, which looks a lot more interesting for a border sash than the usual pindot in the upper left of my design board.
What do you think about the eQuilter online design board?