Start with a square that is roughly the size you want your finished block to be. Or just start with a square in any size and see what happens. Cut some strips of other fabrics, slightly longer than your square.
Slice your square on any angle - through the middle, close to the side, or even lop off a corner. Don't throw away either piece. It is best to keep the pieces set-up as if you just cut them so you can remember how it all goes back together.
Pick up the piece on the left side and sew one of your strips to it, right sides together. Open and press.
Pick up the remaining piece of your square and sew it to the edge of the strip, as if you were sewing the original square back together (but with the strip in between). Open and press.
You can sew one strip or many. The process is the same every time. Start with the square, slice, re-sew, and press. Your strips can be parallel, on an skewed angle, or even perpendicular, like this quilt.
Important tips for this technique:
- Don't start with a square that is exactly the finished size you want because you will lose bits as you re-sew. Start larger and trim down.
- Try not to have strips less than 3/4 inch on the edges.
- Strongly contrasting fabrics work best, but you could get a subtle design with fabrics close in value or colour.