If you go HERE and "launch the visualizer" you can see their whole range of colours and see patches of them put up as well as whole rooms painted with them, at the touch of the mouse. (I wish it was that easy to really paint!) I really like Sherwin-Williams paint. They also have a very thick colour thing which they will give you. It's not a wheel, rather samples of all colours available which you can take home to hold it up and see what you think.