Crafting: When your Sprite crafts gear, specifically orange or higher, you can sell it for a decent price at the AH. Keep in mind, it's all about Lady Luck. Some Sprites are determined to fail you.
Quests: Doing quests will give you more gold as well as items you may be able to sell for gold. Repeats, PC boards quests, etc etc.
Item Mall/Clays/Fortune bags: If you have any AP items or event items, some people sell those in the AH. I sold a couple of Greater mallets for 80g each.
Spend wisely~, if you're burning through your gold rapidly, then you won't be able to keep enough for minor things like pots and repairs.