Party balloon

The party balloon is located in the party room. At regular intervals at certain worlds, Party Balloons start to decend. Once balloons are popped, lucky players may receive an item from them. During a major drop (the items being dropped in the balloons are expensive) popping balloons may be difficult since many people will be in there hoping to get a valuable item. If there is a balloon drop, all bankers in the Bank of Runescape, and the inhabitants of Falador start telling you how much the items being dropped in balloons are worth. Balloons come in different colours.

Red, White, Yellow, Blue, Green, and Purple

http://images.wikia.com/runescape/images/d/d4/Party.JPG a party in process

Party Pete also counts down until the balloon drop. You can also see when the next drop will begin by clicking on the chest and watching the red numbers at the top.

You can add items for the balloon drop by offering things to the chest from your inventory and pressing "accept"

http://images.wikia.com/runescape/images/9/9d/PartyDrop.JPG