I don't know if it will be of any use to anyone .. But I've made a basic Grid - 10 x 6
If You've Got - Vista
You can use the Vista Snipping Tool to get the grid.
In your Snipping Tool Options .. Set the outline to be transparent after pic has been taken.
Use.. Rectangular Snip
Save Grid Picture as a.. PNG
And it's ready to be used as a Stencil