I had a hard time coming up with a design for this challenge. Here are two attempts at a tribal design.
The above design was created using a grey base color and some cheap-o water decals I got at Dollar Tree. It wasn't really "tribal" enough for me, so here's what I tried next:
This design is more "tribally," but I still didn't like it. Anyway, the inspiration is from a YouTube video by an overly chipper young woman.