[Mini game] Take part with the exciting mini game of Great Orb Project and get more RS gold

By accumulating a lot of tokens from each game of the mini game, you can use those to exchange with rewards and sell those at the Grand Exchange to make RS gold sell.

Source: wikia

Participate the Great Orb Project mini game and get more RS gold

You can play this game at the Runecrafting Guild. In order to be able to participate, your Runecrafting skill should be at least level 50 or greater. This place is a great way to make more RS gold and at the same time enjoy playing the game.

One of the great rewards you will encounter is the water talisman. This talisman can be sold at the Grand Exchange and a great item to make more RS gold. You can get water talisman at the token exchanger at the cost of 50 tokens.

When each team wins at every altar, they will receive 1000 tokens per game for MEMBERS and 750 tokens per game for FREE players. It is not difficult to accumulate tokens at every game. Once you have enough tokens that you accumulated, you can now exchange these tokens with rewards at the token exchanger. Water talisman is a good reward that can give you more RS gold when you sold it.