You don't want to wear a hat that looks like everyone else's hat.
You like lions (or dragons).
Now you can combine all of these desires into a simple, yet useful, item of clothing that's infintely customizable and tailorable to your (or a recipient's) tastes.
Disclaimer/apology: Since there's no limit to the variation on this theme, I've only provided the most basic directions. If you have specific questions on how I did certain things, I will be happy to try and explain it in a seperate instructable or through private correspondance.
Step 1: Preliminary measurements and layout
Sewing machine + standard sewing stuff
Scissors, measuring tape
Felt, buttons, etc for finishing touches
Think about what you want to make.
i.e. The lion hat needs a mane and a muzzle, in addition to eyes, nose and ears. I made the mane and muzzle from felt, since I did not wish to deal with unhemmed edges exposed on the outside of the hat.
Measure your head and add half-an-inch: this will be the length of your fleece. The height of the cloth will need to be 9-10 inches, for an adult.
Make ears, tails, spines, et cetera:
Sew your idea on to two pieces of fleece (or one piece folded in half), trim it, flip it inside out.
Place these items to the side.