Actually I am making myself one. I purchased a girls fitted white tee from
Walmart for like 5 dollars and then I purchased the T-Shirt Iron on Transfer paper from Staples. None of the t-shirt designs will fit on one piece of paper though so if I did the birthday hat one I would print three separate pages on the t-shirt transfer paper. Mickey would probably be one sheet of paper and only 11 inches tall (as a piece of paper is 11") and then I'll print the words on two separate sheets of paper. Then you follow the directions on the paper and iron them on to the shirt.
If I did Mickey Cute it would be a little more difficult because I would have to print the whole image split on two pieces of paper and then when I iron them on, match it up perfectly.
I created all these designs myself. Although, anyone can copy me and I'd be fine with it. Also, check out the Creative DISigns board on here. If you post that you want a birthday shirt, someone can create one for you with your favorite character and whatever you want on it. All you do is print what they create and then iron it on to the shirt you buy.
example of how I would split up the printing ^
