Justin Kramer (Australia) has had success using this site with his students.
Colour/Color Schemes in Decorating
Thought that you might like this site. It is from a paint company. Very good
for applying concepts of colour - especially for those students who just use
the colour straight from the tube.
The way I have used this is to get the students to select the colour scheme
and then colour match to the sample. Works became far more individualized.