The pattern for a basic little Pinwheel block is so easy and so versatile. It is used in making so many other blocks but is also great on its own. The Pinwheel block also makes a great cornerstone block in borders and sashings.
This is another basic building block for a ton of blocks. The math behind how to figure out how big to cut the squares is pretty easy. If your finished patch is to be 4” square, cut the squares at least 4⅞” square.