What a great opportunity you're affording people here! I've seen first hand the affects on Asher's Curation and Engagement League, so I like to offer up a contest that I've been judging (along with others) for 20+ weeks now; it's called @pifc, The Pay it Forward Curation Contest. I'm going to let @thedarkhorse give you the details and submit an application, but I can say that it's a perfect fit for your criteria.

Thank you for the opportunity :) You guys are awesome!