Deetor - I'm absolutely positive there are people that do just what you want. I totally agree with you on the effect, it is really second to none.

When I was little I had a friend who lived in this big old house in Ivanhoe. She had the most beautiful scenes painted on her walls, very magical and ethereal. I could have stared at them for hours.
My sister has this funny little bathroom with the biggest, oldest bath you have ever seen. She got a professional is to simply paint clouds on a sky blue wall - I remember thinking "gawd I coulda done that", until I saw it for myself. Just awesome.

I can't ask her who did it if you want, are you in Melbourne?