I've finished the embroidery on my quilt square. The stitches I used were running stitch, backstitch, satin stitch, a fill in stitch and french knots.
Here's the drawing I made which I'm posting as a free pattern in case anyone wants to use it. Right click on the image and choose 'save image as' to save to your computer. Print out in any size you choose. My embroidered square is 6" x 6".
Here are my YouTube videos on this piece.