Strip piecing - if you take two jelly roll strips and sew them together then cut out pieces from that - that is strip piecing - so if you want a four patch you sew the two strips together then cut your patches from the sewn together strip - same idea with 9 patch too.
I - spy - I would say that is a quilt made with novelty fabrics so you can "spy" different objects in your quilt - usually a child's quilt.