I donate several times a year to Unicef, usually in response to a crisis, and I just made another donation today to help the children dying due to a major drought in the Horn of Africa. It was a no-brainer, since I just got a notification that my most recent payment from Dreamstime just posted to my PayPal account.
To me, my Dreamstime earnings are like free money, since I don't have to do anything to get it. I don't really add to my portfolio, it just keeps selling on it's own, and I just request a payment every few months. I think I will make a habit of sending $25 to Unicef for every $100 I earn.