This method simulates a braid join and is accomplished by crocheting pre-edged blocks together. It's fast and easy but uses more yarn and creates a ridge on the back between squares.
Step 1: Edge each square according to instructions for Step 1 of Flat Braid Join.
Step 2: Using matching or contrasting color, hold two squares right sides together matching up corners. Working through both thicknesses, join with sc in first corner, (ch 3, sc in next ch-3 sp) across ending with sc in corner. Pick up next two squares and continue with sc in first corner, (ch 3, sc in next ch-3 sp) across. Squares can be joined in long strips or just two at a time, as you prefer.
Here's how it looks from the front and back: