Three toed box turtles usually don't have color on there shell but more on there skin. I've had very corful male and females. Their color will come in more the older they get. I personally love three toeds and the way they look I've had colorful easterns and ornates too. Let me see if I can dig out pictures.
Here's the 3 toed female I use to have he was very colorful 3 toed.