I just saw Mary Mulari on Sewing with Nancy making a T-shirt quilt. She makes a rag style memory quilt. She cuts the shirt to a 12.5 inch square and layers it with pre-washed flannel, stitches a big X from corner to corner, then sews together rag-style. I like the look of this, and it certainly would cut down on your labor time. You can watch the show here
http://wpt.org/SewingWithNancy/Video...overs-part-one