By using a moko pattern for your own tattoo design, you may be insulting the Maori people. It is never ok for a non-maori to wear a Maori tattoo pattern, even if it is done with respect.
Maori tattoo patterns and symbols are a way of personal identification for the Maori people. By copying their designs you steal a part of their identity, what the Maori see as an insult.
If you want a tattoo design in the Maori style, find a tattoo artist that has experience with Maori tattoos and knows about these issues. He can design a tattoo for you that has the looks of a moko without the Maori symbolic ties."
Have a look at http://www.storm3d.com.
This designer is specialized in Maori / Kirituhi style designs and does custom pieces, and has high resolution designs for sale on his website.
From the web page: http://www.freetattoodesigns.org/maori-tattoos.html
THAT being mentioned.... check here... http://www.maori-arts.com/tikitat/index.htm