I came across these tonight and thought they might be of interest to some of you. Best of all they are FREE!
First one is a 3D layout program for furniture arranging and such. It works with PC or Mac [url]http://sweethome3d.sourceforge.net/index.html[/url]
This one might be helpful when trying to put colours that go together. YOU can use photos or other inspiration to get it started and then it will spit out co-ordinating colours. It's not paint colours by name but it could help to see combos you don't usually think about. I think it works with PC and Mac also.