I came up with this scam a long time ago im not sure if it has been posted already.This is what you do.
1.Go to the auction house and buy low lvl greens and some good twink blues.
2.Buy wrapping paper from a vendor (such as red and blue)
3.Wrap some greens in red paper and some greens in the blue paper along with some blues.
4.In trade channel say "WTS presents red and blue, red presents are 5g and have green items or better in them , blue presents are 20g and have a better chance off getting a blue item or epic"
If people say "where did you get the presents" tell them you got them from a blizzard convention when the game first came out.
You cannot get banned from this because you are giving people what you said were in them.
I would make an alt and if people say its a scam you can tell them that a character named (alt character) got a good item from me.
When i did this i got 700+ gold in 2 hours.