Saw something on fons and porter about making your own 'tilted template' . . . I have a couple of their magazines, I wonder if it is one that I have. I'll go look, but . .
You draw a big square and measure in a small amount, and mark a dot, and a larger amount, and mark a dot. You do this for all four sides. Then you connect a dot from one side to a dot on the next side. If you look at tartan's picture, this crazy description will make a little bit of sense! Of course, I don't remember enough of anything specific to actually help!
I do remember it being called "tilted". Maybe it had dogs in the blocks . . ??