I do my nails with black henna paint. You can buy henna in Indian or Arabic stores. It is a powder made of natural ingrediens that a lot of people use as hair color or as decorating on hands or feet ( especially for weddings). I use it for nailpolish. It comes out matte and lasts until your nails grow out. It becomes a little more brown in color after a while. Here's how I do it.
My nails before putting on new "nailpolish"
Mix a little bit of water with the powder
Mix together using a qtip until its a paste
Start applying on to your nails (you can do two coats if you want)