Gather a small legion of freaked-out-looking garden gnomes (or similarly-tacky yard decorations) and under cover of night, sneak attack a friend's/family member's/teammate's/student's/colleague's yard, distributing them liberally. The 'victim' must then donate to your cause in order to have them relocated to the next unwitting recipient.

To ensure things stay both fun and financially fruitful, tie a note around one of the little guy's necks with all the details of your fundraiser and clear contact info.