It's a very similar method to crafting Cosmic Runes. If you completed Lunar Diplomacy quest you can begin to craft Astral Runes at Altar south-east of the village on the Lunar Isle. Start by taking Runecrafting Pouches, Earth staff, Law essences and runes. While running to Altar Be on the lookout for 111 combat level Suqahs which can hit you very hard if your aren't praying for melee. After you are done making runes , you can use Moonclan teleport and get back to the bank and store your work. This method will give you around 800k gold and 30k exp after the level of 82, when you are able to create double Astral Runes.
Another way to make runes is to use Abyss. If you've completed the stage 1 of Enter The Abyss miniquest you can now use it and craft Nature Runes and , if not, you'll have to accomplish that to use this method. Begin by getting an amulet that will grant you glamour, and taking to your Rune packs and essences.
Visit the wilderness north of Edgeville where you can find Mage of Zamorak through a conversation with this Dark Mage that you can teleport to Abyss. Inside you will be starting in skulls, and if you do die you'll be unable to retrieve everything. Use one of many tunnels to go from the outer ring and the inner rings. You'll need to clear obstacles like mining rocks (which requires mining level) or cutting through woods which block the way so be sure to carry a pickaxe or axe.
After you are done with this, go to the Nature Altar portal and make runes in the altar. Make use of Amulets of Glory to teleport back into Edgeville bank and repeat the process. Take note that the majority of this process is done at Wilderness which means you may be at by other players.
It's worth the risk to lose you Graceful Outfit since it can be easily retrieved but doesn't carry anything more valuable with you. Although making Nature runes requires only 44 Runecrafting they can be profitable once you reach 91 and can create double Nature Runes. At this point you should be able to expect about 20k exp, and around 800k gold every hour.
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