I would take your cues from the layout in the sample picture you showed. You can see how they laid out the charms so that there is maximum contrast between adjoining fabrics. They didn't put 2 blues that were the same hue right together but chose different blues or different creams to touch when they had to be close. Can you pick 1 row or 1 column of the fabrics that appeals to you best and then use those fabrics in that order for your layout, just adding 1 additional fabric?