I write a lot about open-source marketing, but it's not just a nice idea. Businesses are increasingly turning to their customers for fresh concepts. Take this example from Wired.com about a website called Adcandy. Here, anyone can submit their own catch phrases and slogans with winning choices earning between $50 and $500 - small potatoes in the advertising world. So what motivates consumers to participate? The opportunity to share their thoughts seems to be a reward unto itself.