The site is a great idea, especially given the brutality depicted in the movie ""Blood Diamond"" - good luck with it. Suffering children in Africa is a huge problem, not just from the perspective of conflict diamonds though. There's AIDS, ethnic cleansing, starvation, disease, and a host of other problems also - it's pretty overwhelming. It's wonderful that WF is making an effort to contribute in a positive way to a continent riddled with problems.
Having a few recognizable designs is the perfect way to approach it. You'll just have to market it hard.