I made stencils for
Disneyland shirts using freezer paper. They iron on and you need one for each shirt. I did a very simple design (Mickey head) which I cut out with scissors, but have since made slightly more intricate designs (sunrise shirt, for example) using an exacto knife to cut out. There are freezer paper stencil tutorials all over the internet. I believe you can even cut freezer paper on a Cricut or Silhouette if you have one (I don't, sadly). The girls shirts are glitter Mickey heads and the boy's Mickey head is just painted. Not sure if this is what you meant, or if you wanted to buy stencils. Good luck making shirts and have a great trip!