So, here’s my interpretation of Diamond Mint in the Equestria Girls style, using the Equestria Girls Avatar Maker by Kawaii Games.
 
Since this dressup game doesn’t have a means of entering hex codes for colors, I got as close as I could. I would have liked the darker color hair to be a little darker, but still lighter than the next step darker.
 
I feel her attire is evocative of the saddle her pony counterpart sometimes wears.
 
I did edit the “finished” product somewhat: I added the flower her pony counterpart sometimes wears, put her pony counterpart’s cutie mark, skewed 20 and 20 degrees horizontally, on her shoes, and typed her name - one of them, anyway – in the Equestria font.