For those looking at external colour visualisation for their new home I would try this online tool I found it really handy (keeping in mind you can't beat the real thing, ie colours in real life under different conditions react different ways, but the screen images help you get a bit of an idea):
http://colorbond.autech.com.au/onlinevi ... esidential
The best part about the tool is that it let's you change colours from the ground up.