The easiest way I know of to look for patterns it to do a Google image search. I searched for "flannel quilt patterns"
Here is the link:
http://www.google.com/search?q=flann...ls=org.mozilla:en-US:official&prmd=imvns&source=lnms&tbm=isch&ei=DOGuTrqVO4GJsgLo4dX9Dg&sa=X&oi=mode_link&ct=mode&cd=2&ved=0CEAQ_AUoAQ&biw=1024&bih=651&sei=%20WuGuToPmMsStsALc9_z9Dg
Often times if you click on the image, you'll be taken to a link where you can find or purchase the pattern. There are a lot of really cute flannel quilts on the link. "Dad or Daddy's shirt quilt pattern" might be another useful way to search. I hope this is helpful and I am very sorry for your and your mothers loss.