Mickey Head

Always prewash your items.  Then start with a wet shirt (or article of clothing), then tie it, then soak it in soda ash before dyeing.

Here's a step by step tutorial

http://www.adisneymomsthoughts.com/2011/09/tie-dye-mickey-mouse-shirts.html

Very cute video tutorial

 

Do NOT remove the rubber bands or string until AFTER you've put the garment through the rinse in the washing machine.  When you're all done and the shirt is dry, iron with a hot iron.