Could I use metal buttons as a capacitive button for my arduino project? Could I use something like this as a capacitive button for my arduino project?

http://www.banggood.com/10pcs-25mm-Vintage-Round-Metal-Buttons-Craft-Scrapbooking-Sewing-Suit-Shirt-Button-p-1011485.html

If I connect it into something like this... http://www.banggood.com/MPR121-Capacitive-Touch-Sensor-Module-For-Raspberry-Pi-Arduino-p-969002.html

Would that make that button a capacitive button? Or am I totally barking up the wrong tree here?

Thanks :)
Yes, that would work. 

The only thing to watch out for is that the buttons might be plastic with a thin layer of metal on top (Chemical vapor deposition).