Color coding a lot of major sections inside a website

So I have a website that consists of 15 major modules or lack of a better term sections. Each of these consist of very different objectives. One presents news the other shows you a job listing and ext. I was thinking color coding each of these sections and giving them unique icons to help the user navigate easier by association. I'm just wondering is this a bad idea because of there being so many sections. This would require me to insert 15 different colors. Right now I'm using just 6 colors and proliferating them to all 15 major sections so this means replicating the same color for different sections. The problem I have with that is that its not tying each section to a different color which might confuse the user. What should I do? Inside this picture I have a rough mock up at the top and my swatch configuration at the bottom.