I've probably done more quilts using snowballs in some form than any other block. It's a very forgiving and variable block. I've made them as all snowballs and with alternating blocks, or with a pieced sashing for my cousin's wedding, I used a large themed print as the center and then 2" assorted coordinated blue squares. For a different wedding (and a long story) I alternated larger snowballs with 54/40 or Fight, to make what is now called Tennessee Waltz:
https://www.quiltingboard.com/member...14-621636.html
I tend to prefer a larger cut on the corners, so typically use a third of the block as the measurement. Sometimes though when I'm using it as an alternate block to match the other units I might have to divide it in 4ths or other measurements. A couple months ago I was feeling the need to work with some set-in seams so I made this top alternating Lemoyne stars with snowballs and small corners:
https://www.quiltingboard.com/member...14-621720.html
I really like using a square with a diagonal drawn on it, and then I sew on the line and cut off the excess. For smaller squares it doesn't really waste much fabric, for larger cut offs, well you can always sew them into HST if it bothers you. It makes the math easy to figure out. Plus, you don't run the risk of putting on a triangle to the wrong side a trimmed to shape block.