This is the technique that I have heard about but never tried yet. I have heard that this sitch is recommended for quilts that go to shelters, humanitarian projects, etc. because it's sturdy.

courtesy of Fabric-Mill.com
International Stitch or Blind Tie (Stitch) :

This technique for tying quilts eliminates the tied ends from showing, which prevents the ties from coming undone. This also give it a clean bar tacked look on both sides of the quilt.

Select either Knit Crosheen or a sport weight yarn.

Use a polyester bonded batt.

You will need a 5"-7 ½" inch doll needle (available at the Fabric Mill)

1. Begin by setting the quilt on a frame or you can use a hoop.

2. Thread the needle so the ends are even. Pick out a 3"-4" pattern on the quilt to place the ties. (If the fabric doesn't have a pattern, there are quilt marking systems available.)

3. To begin making ties, insert the threaded needle through the top layer of fabric into the batting (but not through the bottom layer of fabric) 3"- 4" away from the first tie.

4. Bring the needle up through the top at the spot of the first tie. Pull the Crosheen (yarn) up, leaving a 3"-4" tail inside the batting. DON'T PULL THE TAIL OUT!

5. a. Staying near the point the needle came up, poke the needle down through the top fabric, batting & bottom fabric. b. Take a small stitch and bring the needle back up through all 3 layers. The stitch should be about ½" long.

6. Take the needle back into the batting (not through the bottom fabric layer) and bring the needle up through the fabric to the next spot to tie.

7. Repeat the process until you run out of Crosheen (yarn) or finish the quilt.

8. To tie off tunnel through the batting 3"-4" then pull the needle up through the top. Cut the thread leaving a 3"-4" tail inside the batting.

Kind of like the process for doing stamped cross stitching so you can't see the stitching on the back of the quilt. Thanks for info, its a great tip!!

i'm doing something similar to attach the unquilted top to the already quilted back of the gray and pink quilt i'm working on now. the main difference is that i'm using teeny tiny stitches, only in the ditches, and spacing them about 1/2" to 1" apart along those seams. i'm stitching along all seams, both horizontal and vertical. from the front, unless you get up as close as i am while working on it, you can't tell it's quilted at all.