I had an old grey shirt hidden away in the back of my closet, and some old acrylic paint left. I also had just enough freezer paper left from my last shirt project to use. I love it when I have all these materials just laying around-- it's nice not having to go out and buy materials. Even if the acrylic paint is probably over ten years old and is kind of sketchy. It's free. That's all that matters.
My design! Well, Nintendo's design. It's called the Hyrule Crest, and is a big symbol of the Zelda games. You can't really see the triforce that is in the center of the design.
The cut out design.
So yeah, if you're making a shirt, definitely check that.