Paper Piecing is a pattern on paper with straight lines. You put your fabric against the paper, and stitch on the line, iron it back & aleign another piece to stitch on a line. Here is a link for a tutorial to explain. But it's a nice way to get precision blocks, just "stitchin on the line" like coloring in the lines as kids. :thumbup:
http://www.youtube.com/watch?v=cgr5JMxNfow