Well, they can be bred together to create double hets that can be bred back to each other for a double recessive. However, I've never heard of this being done. Creating a double recessive animal is a very time-consuming process and I imagine most breeders choose to use their expensive recessive animals for projects that are more likely to produce visually stunning results.
Although, who's to say that a Caramel and Lavendar would not be an amazing combo??? It's all a gamble.