Here is the link to the back of my quilt that I posted yesterday. I too use left over fabric with some pieces that I purchased. I plan it out on graph paper and yes, it does take a lot of time to do this.
Hmmm..........I don't know if the link will work. I can't find a spot to fill it in so I'll copy/paste below!
http://www.quiltingboard.com/picture...l-t168039.html