My idea is for a website for people wanting to either do charity work or donate to a charity, but aren't sure which charity is best for them.
This website will match your personality with a charity you may like. The person wishing to donate will fill out a questionnaire. This information is loaded into a data base that matches the person to an appropriate charity. The website will generate income through advertising.
Reward: 30% ownership in the concept is the reward for a website designer/developer.