the stained glass technique is great for the quilt mama described. i've also seen them made using applique techniques, etc. basically, it's a scenic quilt with window sashing and panes added to the "picture". i think i saw one demonstrated on Simply Quilts.
i can't remember where i saw the one i thought of when i read the question. anyhoooo ... here's a link to a traditional attic windows pattern that has a differently shaped top, just in case that's what mama wants.
http://www.quiltingassistant.com/hiddenwindows.html