I would go to the store and buy a pad of graphing paper...the green printed kind has more guiding lines, so you probably want the white kind with 1/4" boxes. They're really cheap and you can probably get them at the grocery store.
I used Excel to chart for my brothers' Charlie Brown zigzag hat...just stet the column width & row height to the same size, and tell Page Setup that you want to print the gridlines...
Wow, that Knitty article was great -- thanks for posting it!! I created an action in Photoshop (like a macro) that does all the steps...what a timesaver!!
This is a little download....you can choose the size of graph per inch. Right now it is being mostly used for mthe 9 yo's math homework. i've planned many a quilt with this!!!