I have used 1 1/2" strips but only for a log cabin table runner and in a medallion log cabin for the cabin; but I prefer at least 2 - 2 1/2" strips, just my personal preference, as I find keeping the 1/4" seam allowance difficult to maintain on the 1 1/2" strips. But that's just me as I can appreciate quilts made with 1 1/4" strips.