Mine sound like they are the same color as yours right now. When the weather was cooler they were blue. Many of the species Impatiens will change color depending on the growing environment. Why the do this I dont know. I think they will revert back to blue as the weather cools.

Here are links to pictures of Impatience namchabarwensis blue and to another blue impatience, Impatiens arguta, respectively. Note the color of the tails, which as far as I can see is the primary difference.

http://www.strangewonderfulthings.com/169.htm
and
http://www.anniesannuals.com/plants/plant_display.asp?prodid=1306&account=none

or go to http://www.anniesannuals.com and search for Impatiens arguta.

Both anniesanuals and strangwonderfulthings offer exotic impatiens plants.

Enjoy, Kay