For the nicest possible finish, I also like the slice off the corners idea. It's one of the nice things about how triangle math works. Remember to account for the seam allowances! Typically I would make one of my positioning templates out of the gridded acrylic template plastic.
That would make it smaller -- and it would add up over many repetitions. So -- for larger the strip idea is awesome, if you picked some sort of print that contains all three colors, it will tend to visually blur at the not-so-pointy points.
Or, you can just put them together with blunt points and call it good enough!. We learn each time (and some of us take a few repeat lessons learned over decades...). You can learn some more by experimenting with a different basting or quilting or some other technique.
Or, you can tie it together with buttons over the points and say, why yes, the embellishment was a design decision -- and you don't need to say why!