Hopefully your strips are die cut. If so, they will probably all be the same size. There are lots and lots of patterns to use with jelly rolls. I am sure there are free patterns on the web. If you don't see anything you like, look on amazon for books with patterns for use with jelly rolls. There are also other used book sites that could have quilt books for a lower price. I haven't looked on these sites for books about quilting but you might try
www.alibris.com or
www.abebooks.com I have no connection with either of these sites/stores.