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If you purchase Heavy Crafting Bags with Laurels (1 each) then you should get around 1 gold per bag. The items you can get are all Tier 6 crafting mats currently worth around 20 to 35 silver each and you get three each time you open a bag. Since the vast majority are 30+ silver (pile of crystalline dust is the only one worth less than 30 silver) you should be earning close to a gold average per Heavy Crafting Bag.
You can also spend your laurels on +magic find and +experience boosters that last an hour each. Having both of those and farming for an hour is the best use of your laurels, but it requires that you spend an hour to make the extra money. If you need a fast way to convert laurels into gold then buy the Heavy Crafting Bag!
Turn your karma into gold here (1 gold per 10k karma).
Turn your skill points into gold here or an even better method here (20 silver to 1 gold per skill point).
During the Escape from Lion's Arch event, your best way to turn Found Belongings into gold is by purchasing Sprockets