There are several if not a dozen or so different rulers for this. If you don't like any of those already out there, you can make a template pretty easily by drawing a rectangle and angling one of the sides. Then you 'mirror image' that shape.
I have a couple of rulers. I bought the Easy Dresden so many years ago I don't even remember when... that's the one I used for my table runner.
I also bought The Crumbler from Miss Rosie's Quilt Company last year. That was before Carrie Nelson closed down her shop and went to work for Moda. But you can still get the Crumbler and the other tiny version on Amazon.
|I use my Little Wooden Iron all the time for small seams until I can take a big batch over to the ironing board.|
|The seams on the lower one were pressed down with the LWI, the top ones were pressed with the Big Metal and Plastic Iron.|
Once I had fours I laid them out on my table and tried to figure out how big the table runner would be. I had about a quarter of my table covered in width, so that was about 26-28 inches. Of course there are a million seams to something when there are this many pieces, so it turned out much smaller.
Then I sewed them into rows, and pressed again, then sewed the rows to each other. The edges were of course wonky because of the shape of the pieces. If you're working with larger pieces it might be OK to precut the end pieces in half, but for these, no way.
I found a piece of batting that was just the right size, and a nice red and green print for the back. With the application of a striped binding and a little channel quilting between the rows, it was done!
It ended up approximately 14 1/2 inches by 20 inches. I like how it turned out. It was a fun little project. I hope whoever wins it at the LCQG holiday party enjoys it.