100 studs

I really wanted to stud the underside of an oversized bag because I liked how the studs would remain discreet yet, just from the right angle, people can sneak a peek of the spiky goodness hidden beneath. I also knew I didn't want small wimpy pyramid studs, so I found some fairly massive 1 inchers which looked heavenly.

If you're interested, all you need is:

* a bag you're willing to sacrifice for the purposes of DIY
* studs (Gold or silver, it's your pick. Also, measure the underside of your bag and make sure you'll have enough studs to fill it up entirely. There's nothing more anti-climactic than getting excited studding and then about 3/4 the way through realize you're short about...50 studs. I calculated that I needed ~100 1"x1" pyramid studs to fill the entire surface area)
* an exacto knife
* kick-ass music playlist (I don't remember exactly how long I was studding for, but you can imagine for ~100 studs, it's quite a while. Good music will keep you sane.)

Before you place a stud in, imprint the prongs on the leather. Then take the knife and cut small slits where the impressions are. Pop the studs in, fold the prongs down, and you're done.

Good luck!