Portrait of Chief Moses Horoenah in Costume with Ornaments And Holding European Cap with Emblem and Patu (Club) 1862
Courtesy of the Smithsonian Institution
The Maori Language Commission
Here's a portal for a variety of Maori-related web sites
PBS did a series on tatooing in the Maori and other Polynesian cultures. It's called "Skin Stories: the Art and Culture of Polynesian Tatoo".