The easiest way I've seen (which avoids a Y seam) is to cut two
rectangles -- one of your dark fabric and one of your light fabric -- the
same length as your block (if it's 12-1/2 inches unfinished, then your
rectangles would be 12-1/2 inches in length) and whatever width you want.
For the corner, make a square from half-square triangles -- again, one
triangle would be from your dark fabric and one would be from your light
fabric.

Sew the dark rectangle to the side of your quilt block. Sew the square and
the other rectangle together, matching the light triangle in the square to
the light rectangle. Then sew the new piece to the bottom of the quilt
block, matching the dark triangle in the square to the dark rectangle.

As I look at this, it makes total sense to me, but it may be even more
confusing. This Web site may make it a little clearer:
http://www.quiltaholics.com/bom/attwin.htm

Good luck!

--
Louise in Iowa
nieland4 at mchsi dot com

wrote in message
...
I've been quilting for about a year and want to do my 1st king size quilt.
It's a little ambitious for me, but I love the attic windows block. I've
seen different methods for doing this block, but they look a little
complicated to me. Is there an easy way to piece these? Thnx for your
help.

Barbara C.