Nell's star is a favorite of mine.
PP can improve hard points, but you have to pin when you join the sections to get good matching at the sections. I pin PP sections different then any way I have seen done, but it works for me. I poke the pin straight through both layers at the exact 1/4 inch seam line w/ the pin pointing down on the leading end (first one to go into the machine) and poke a pin straight through the seam sew line pin pointing up on the back side of the edge. Make sure the pins point straight up and down and don't "squew or twist" then take the first pin out being careful to hold the fabrics in place. I use the rear pin as "steering" stick as I sew until it gets close enough to need to be removed.