It is possible to earn a LOT of karma during Wintersday by "farming orphans" or (my favorite) "grinding orphans." Here's how:
Talk to the Charity Corps Seraph in the Crown Pavilion of Divinity's Reach.
Buy Wrapping Paper and Toy Skins from this NPC. Then turn those into Wrapped Gifts.
Before you go looking for orphans, stack up as many karma buffs as you can.
Now run around Divinity's Reach giving those Wrapped Gifts to orphans. Each orphan will accept one present per day, and will reward you with karma.
There are several maps of orphan locations available. The map at GW2timer.com includes a route so you can be sure to hit every orphan without having to backtrack.
Do this every day during the Wintersday event!
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