It varies for each Zelda game. Usually, there are games within Hyrule or the Market (or Clock Town in Majora's mask) that should be easy and offer nearly an 80% rupee increase (you have to pay to play the games). Find a game that you're good at and earn those rupees.
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Of course, the fastest way is to buy them. If you choose to earn them you can do deeds. Check on Lotro Wiki for lots of deeds. Another good way is to do the quest from Jon Brackenbok and earn 10 turbine points. It can only be done once on each server.
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The fastest way to earn Kinzcash on Webkinz is to go to Quizzy's. Some other ideas is play in the arcade daily, go to the Employment Office, mine at the Curio Shop, garden and sell your crops, do the today's activities, play Alyssa's Star Challenge in the Magical Forest, and play in the Tournament Arena.
Just try several ways and see which works best. Try to calculate how much you earn per hour with different methods.