Teresa, this is an Attic windows block with a HST in the corners. Here is another link. See if this one will work. No letters, but you could get some off your computer to enlarge.
All you would need to do, is make the HST out of different colors (to match the pictures on TLC) and turn the block so they are on the top and left, instead of left and bottom. (clear as mud? lolol)
http://www.straw.com/equilters/libra...ticwindow.html
And here is another:
http://www.quiltingtreasures.com/stu...ojectsheet.pdf