When you open up a particular pony and then click on the little arrow in the upper right hand corner, a row of buttons pops out. Click on the "Characteristics" button, the one with the bar graph on it. Your pony's colors are on the little menu that pops out. The color swatches are usually square shaped, but special colors = special shapes.
Also in your barn there are the buttons at the top with drop shapes on them. If you click those, you'll see the color shapes and other tools for color selection. They're for viewing ponies by color.
I'm not sure exactly how it works, but this version of PV has certain color guidelines. I'd wanted to point you in the direction of a thread, but I don't remember where it is and I'm not spending all day looking for it. Suffice to say that Misty Ponies are identified by gray-ish colors. Misty is a color classification.