jelly rolls are 2 1/2" wide by the width of fabric cuts. They are packaged in the stores by laying all the strips on top of one another and rolled into the jelly roll. Is this what you were asking. I hope I understood what you meant.
edit: then you sew, cut and resew as you wish to make the pattern that you like or you can cut the strips into squares, traingles, etc then sew them into your blocks.