The wonder of sewing is the ability to join any kind of style of fabric you'd like. I have boys they love super heros, they love the Teen Age Mutant Ninja Turtles. I tried to find a picture of the TMNT's running because that is how my boys run everywhere now; with there chest sticking out and their arms behind them (I guess this is how ninjas run). Imagine my joy when I found a pattern for karate pajamas at the Salvation Army store. Perfect for Christmas! And, it was perfect except that when I went to make them the pieces to the karate top were not there, grrrrrrrr. Sure I could just make them regular jammies but by now I have my mind made up that they will haven ninja pajamas!