up here they paved a long walkway at a big playground with help of donations. folks "bought" a paving stone (in different sizes and associated $ per stone). each donor got to have their name painted or etched into a stone. people gave in DROVES, cuz up here, wealthier folks who donate LOVE to see their names in print, so all can see how "generous" they are.
now, axe, i am not saying this is YOUR intention, i see where you are going with it, but it might work as an incentive to some others...