I found an airbrush artist online in my area, called and emailed him a few times going back and forth with what I wanted and ended up taking my front emblem and rear fake gas cap off and mailing them to him and he custom painted both.
I found it far cheaper then looking at custom painted one's already done online as the prices of some of them were staggering. I paid $100 to get both of mine done. Avatar is the gas cap and here's a pic of the front pony....
Here's his website. I had mine done close to year and half ago now and they still look awesome. I will warn you that it did take him a while to get them done, he had both emblems for close to a month I think but I was very happy with his work.
He took pictures and emailed em to me to make sure it was exactly what I wanted before he shipped em back and I had him make a couple small adjustments which he did for me.