Pretty centerpiece idea.
I like this for an outdoor party, you could even submerge some cut flowers instead of plants, party decor, table decor. Helga Noack
Submerged calla lilies with floating tea lights - stunning!
wall of balloons
jenga guest book -
Sewn paper small present packages- perhaps in suitable shapes for the Pirate Party goodie bags or treasure hunt? bones or fish?
Roses & Grapes..Nice simple centerpiece