Use whatever fabrics you want to use. Even if you were to use the same colors the shop used, you would be creating your own masterpiece. I've have never taken a class that called for a specific line or color of fabric. Every one of us, it seems, has his/her own color and fabric likes and dislikes. All of the quilts in a class may follow the same techniques and patterns, but every single one of them is different. That's what makes quilting such a pleasure for me: there is so much variety. Go for what makes you happy and enjoy your creativity!