Here's what you'll need to make your own:
scrap piece of cardboard
 start by tracing your design onto a piece of freezer paper
 using our exacto blade (or scissors), carefully cut out your design.
Whatever you cut out will be painted onto your shirt.
 iron your freezer paper template directly onto your t-shirt (shiny side against your fabric).
 apply 2 thin and even coats of fabric paint to your shirt and
patiently wait for it to dry (follow the directions on your paint).
 Once dry, carefully peal off your freezer paper.
Decorate the rest of your shirt with some squeezy fabric paint and other fun things.
I used a sponge and brush to make spikes and puffy paint for additional spots on the dinosaurs belly and spikes.