Do you keep track of your market (what your customers tend to be drawn to)? I'd bundle them based on what sells best for you - how about grouping one of each fabric design together by color? What I mean is take one each of the greens and bundle them together, all blues and bundle together, etc. Fold them in an interesting design and add a little "bonus" to the ribbon - a little silk flower, a little bell - something inexpensive but unique.