This is said with much love - you are being silly.
You saw a quilt and fell in love with it to the point that you PAID for a class and are willing to travel TWO AND A HALF HOURS to take that class. You can make that quilt any dang color you want!
About 6 months ago, I made a shop sample for my LQS. The LQS owner made about 50 kits with the same fabric I used. She sold out of the kits and had to make more. She sold out of
those kits
and the pattern, and is currently waiting for her second batch of patterns and third batch of fabric bolts to arrive so she can make more kits. Do I feel insulted that her customers are "copying" my quilt? Heck no! I'm very flattered and gratified that something I did has helped increase her sales. I know you didn't purchase a kit, but you purchased a class and I'd be willing to bet you'll spend more money while you're there. That's a good return on her investment of hanging that quilt. If she didn't want anyone to copy it, she wouldn't have hung it where everyone can see it.
