I hate picking out 40-45 different fabrics. Jelly rolls do this for you. I made 1 quilt using jelly rolls and love all the color/patterns that came in it. I never would have found or chosen all those great colors! There are alot of really nice patterns using jelly rolls. Also there may be less waste using them since you do not have to buy fabric and then cut it to 2 1/2" strips.