Uhm. Yes, you can get a custom Pony. Just fill this out here so I can get a little more info. ^^ You can use hex codes if you want a more exact color.

Unicorn, Earth Pony or Pegasus?

Body Color:
Eye Color:
Base Pattern?
None [ ]
Zebra Stripe [ ]
Dorsal Stripe [ ]
Appalloosa [ ]
Splashed [ ]

Mane & Tale?
Rainbow [ ]
Two Colors [ ]
1.
2.

Special Marking...(Up to 1)
Sparkles [ ]
Easter Egg [ ]
Apple [ ]
Snowflake [ ]
Cherries [ ]
Umbrella [ ]
Bow [ ]
Raindrops [ ]
Bubbles [ ]
Seashell [ ]
Star [ ]
None [ ]

Custom Ponies are 200g, they grow but they're not breedable.
Also, I use squiby to make the Ponies grow, is that okay?