That's interesting to hear, when I ordered mine back in 2012 (delivered early 2013), the only colours shown on the website were black, rhodium, black carbon fibre, limette and orange but there was another picture doing the rounds of all of the other available dial colours with a number beside each option. I just asked Luisa if I could have number 9 and it was done.Unfortunately, the only colors currently available are those shown on the website. I sent an email to them recently to ask about other colors and that was the response I got. I'm hoping they will bring back some of the more unique colors. They've made some great blues in the past, as well as some more unusual colors.
I think it's great that you can order a watch from Stowa that you can be assured not too many other people in the world will own. I'm pretty confident there aren't hundreds of eggshell blue Prodivers like mine in existence. My other two favourites from times past that are no longer in production are the turquoise and white. My eggshell blue is awesome but in truth it would have been second choice if the turquoise had been available.