Phillips Fiber Art has a lot of patterns & books that use the 10 degree ruler. Cheryl, also, has some free patterns available.
https://www.phillipsfiberart.com/
If you wanted to enlarge the poppies pattern, you could come in from the other opposite corner with a backwards cut from the strata that you sew to make the first corner arch. Look at the Spiral Table Runner to see what I mean.
https://www.bing.com/images/search?q...tern&FORM=IGRE
I'd love to get that pattern. Would you please share the complete name of it?