For joining the two blocks together I held them with the right sides together and started just inside the corner, leaving a tail for finishing. For joining the two sets of two together I held them right sides together and worked from the center outwards. Where the four blocks meet a stitched and X through both loops of the central triple crochet, following the maxim that if you can't hide it don't try, make it part of the design. As I was doing the double crochet edging I would work just past where two blocks met and then go back and do a little bar stitch joining the central triple crochets through both loops.
Project: Mosaic Four-Patch by Melinda Miller, September 2011 Unique Sheep Crochet Block of the Month
Yarn: Pashmi in Blueberry and Mint
Hook: C -2.75 mm