It's awesome! IMO adding white to the paint will make it truely a Smurf blue. Don't use white as an accent color though, you need to go with a dark color....black, brown, burgandy.....
Maybe make a false window out of contact paper? You can make false trip out of it too. Use your imagination but if you want to avoid Smurfiness...avoid white!!!!
Can you ask your friends/neighbors/family for any left over paint?
Put an ad on Craigslist asking for free, dark paint....bet someone out there has some they'd love to give you!
Heck, if you lived in the Pittsburgh area, I could give you some! hahaaa!!!