You could try this site, i remember looking for the same thing - but i didnt have a lot of success, this has the wattly colours and includes the colourbond colours which could help - maybe??!! Good Luck
http://www.wattyl.com.au/ColourDesigner ... erior.aspx
Thx Madhouse1, I have now given your link a little try as well. Overall, it is difficult to really get a true sense and DH is not great at visualising....