I started my postage stamp quilt a couple of years ago using the 1.5" fabric swatches Keepsake Quilting used to send out as leaders/enders. A few months ago I started sewing the pairs into 4-patch blocks but had to square them off to 2.25" inches because not all the swatches were true 1.5", so the finished stamps are 7/8". A few weeks ago I started piecing the 4-patch blocks to make 64-patch blocks when I had an oh-oh moment. I realized the KQ swatches were not prewashed/preshrunk/color set! But I was not about to toss out a dozen or so blocks. :-D Since many quilters do not prewash without problems, I figured I could do the same. I'll wash the finished quilt with a color catcher and hope for the best.