I started with some bright colorful fat quarters of novelty fabric, cut them into squares:

then added the sashing:

I used a slick new trick for making half square triangles.. I'll show that in a separate post. The half square triangle is what make the optical illusion work on the Attic window quilt. here's Quilt 1 all pieced together:

And Quilt 2 almost all pieced together..

Now to add borders, Backing and quilt them!