some stuff we need by the first gathering

1. justin's idea of running water throughout the service is great, so we'll need fountains, waterfalls and the like. what else can we do?
2. 2-3 floor lamps (should be about $15-20 each)
3. modeling clay
4. 2 or 3 drop cloths
5. some 8 1/2 x 11 plexi sign holders (a 4 pack is $20)

what else?