I don't understand why you wouldn't say what color you got.
[I mean this next part in as polite of a way as possible]. Are you wanting to keep people in suspense? Not have others copy your color? People will be curious as of this posting, but no one is going to be sitting on the edge of their seat for the next 3 months waiting to see what color you got or who shot JR.
But, if you post what color you picked you could talk about it, how you came to the decision, what you liked about it, what you maybe discovered about the characteristics of that blue vs other blues that other people might not have realized yet. There could be a discussion about it. You know, like on a discussion forum.
I am still looking forward to seeing your car though.