Structured shoulders are here to stay for atleast a few more seasons, so how does one DIY these more extreme theatical pointy shoulders using a blazer you already own? I would suggest taking ordinary shoulder pads, folding them in half and stitching one corner so that they sit more with a pronounced point. Then stitching them into the jacket. You don't want bulky shoulders as much as you want fine pointed ones, and making sure the jacket is nice and fitted will stop the jacket looking boxy.