I have been collecting masculine flannel fat quarters for years. Just now working on a lap quilt for DH. I promised him there won't be a single flower! I'm using the Window Pane D9P from Missouri Star Quilt Company. I bought some Moda dark brown flannel tone on tone for the Window Pane. Cut into 1 1/2" strips for the panes. It's looking really good. About ready to lay it out on my design floor (aka living room floor). Just a note - I was able to get twelve 5" squares from each fat quarter.
There are several Turning Twenty books that uses fat quarters. Some look complex and some are really easy. Look them up on Amazon - you might get a good deal.