Quick, and awesome project to make safe throwing stars for children. They don't fly terribly well, but young kids wont notice.
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.
No pictures for this step, if you don't know how this part is done, Instructables might not be the place to find out, but the internet has plenty of other sites that should help.
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.