I picked up a cheap pair in a used leather goods shop and bought some fake nails.
I glued the nails to the gloves, and painted the nails with matte black nail polish like so...
You could use acrylic paint too, but the matte nail polish I have is pretty nice and wouldn't chip. I also have matte clear (top coat), so the color is pretty much going to stay on these gloves forever.
If you're wondering where I got matte nail polish I ordered it from Knockout Cosmetics, they carry a ton of really cool matte nail polishes.