Here's a few, but if you'd give us more information about what you want it would help. For example, do you want cables or blocks? Do you mind sewing parts together? Do you only want to a certain needle size or a certain weight yarn?
http://www.ravelry.com/patterns/libr...square-blanket
http://www.ravelry.com/patterns/libr...-comfort-throw
http://www.ravelry.com/patterns/libr...-cabin-blanket
http://www.ravelry.com/patterns/libr...ld-a-log-cabin
That last two are all garter stitch and each block is attached as it goes so no seams.