If you don't measure, how do you cut your fabric to the "same length and width?" Do you cut the first piece then use that as a guide to cut the rest? if so, you are measuring, you just are not using a ruler. You are using your cut fabric to determine the size to cut the next piece(s). It's just like old fashioned quilters who used a cardboard template, not a ruler. If you are happy with the result, then you are all set. If eventually you do want to make a specific pattern you can always take a beginning quilting class at a quilt shop.