Step 1: Materials:
Soda Tab (I think that's what it's called)
Step 2: Step 1:
Take your pliers and soda tab and make an "arch" shape. This will make it easier to put in the paperclip.
Step 3: Step 2:
Now take your soda tab and put it inside your beer cap.
And now take your pliers and began to push down the beer cap's edges.
Step 4: Step 3:
Now take your safety pin and put it inside your soda tab.
Make sure to put the opening upwards.
Step 5: Final Step:
Now paint anyway you want and you're done! Pin anywhere you want! Don't forget to add Mod Podge to add a gloss and seal in the paint.