As I half jokingly mentioned in an earlier post, back in the day when you were customizing a pony you worked with what you had. I distinctly remember designing a custom unicorn to be made in the G1 Posy pose, then being terribly upset when it dawned on me that it was an Earth Pony pose, not a unicorn. I don't believe I gave any serious thought to trying to create a horn myself.
Later, however, some more experienced customizers, Woosie foremost among them, began creating customs with the addition of sculpted parts. It was amazing what she did with with clay. Naturally, I eventually worked up the nerve to try some sculpting of my own.
Genie was my first attempt. It's only a small sculpt, the genie's lamp symbol, but it's a start. The symbol was made with Sculpey clay, which has to be heated to be cured. Rather than risk melting the pony in the oven, I immersed the body into boiled water instead, which works just as well for small amounts of Sculpey.
Genie was made for Baginslover in the 2008 MLPArena Disney Custom swap.