You will want to get the thicker 1/4 inch craft foam as the thin 1/8th stuff is just too flimsy.
Step 1: Have Kids.
If you don't want to have kids (its a long wait) you could adopt, or find somebody to love that already has kids. I did the latter, and now I have two awesome dudes to make throwing stars for.
You could, theoretically, make them for yourself I suppose too.
Step 2: Find your inspiration.
Step 3: Create vector images of the throwing stars.
Make sure your line weights are small enough to be read as a cut line on the laser. If you don't know how to use a laser cutter, or don't know where to find one, try TechShop, we have you sorted.
Step 4: Take your file to the lasers and cut it up.
Make sure you know what youre doing so you don't make a mess of your foam or the machine.
Also helps to clean the lasered edges with alcohol or so to get the burn smell off.