This Lasagna quilt top is made with varying widths:
http://lynbrown.com/?p=109
Are you talking about the 1600" quilt?
I worked out a formula for using wider strips from existing stash if you were doing them for charity - less strips, less sewing, quicker quilt.
http://www.quiltingboard.com/t-146958-1.htm#4014605
You need the approx ending size of the quilt and finished width of the strips - the formula should work.
Should. :mrgreen: