First of all you're going to need to make a template -unless your name is Cat then you can just use my template (I suggest printing out my template anyway so that you can get your size right).

Draw around the template on to shrink plastic. I used white but you can pick whatever colour you like. Remember to flip the template and draw the reverse too. I only wanted one earring but if you want two, do this twice, so that you have 4 letters in total.

Cut these letters out. Use a cutting knife to cut the smaller, inside letters out. Lay one on top of the other in the position you would like them to go.

Hold the letter and it's reverse together and punch a hole at the top, in the middle, through both letters.

Shrink the letters in the oven until small.

Line up the two holes and glue one letter on top of the other.

Embellish with rhinestone crystals. Use tweezers to pick them up, dab in strong, clear adhesive glue and stick in place.

Slip a jump ring through the hole, slip on to a chain and attach the chain to an earring hook.

Wear proudly and go craft shopping with all the money you've saved :D