This is a type of stack and whack design. Stack 7 different fabric squares (at least 1" larger than desired finished squares) Cut in about half on the diagonal, then sub cut these pieces. This quilter used three for one side and four for the other. Arrange the colors to form 7 different blocks.
Assemble using 1"or 3/4" black strips. square up and you have quick crazy blocks. Good luck.