This is a classic table trick, Buddha Papers Mystery. You should find it useful when performing for only a few spectators.
Effect:
The performer places a coin in the center of a yellow-colored square sheet of paper, and folds it up into a small packet.
Next, he places the packet in the center of a green-colored square sheet of paper, as before, he folds it into a small packet.
Finally, he places this packet in the center of a pink-colored square sheet of paper, and again, he folds it into a small packet.
This is placed on the table covered for a minute by the performer's hand, then reopened with a surprise - the coin placed within the innermost packet is found to have changed to a currency note!
During performance spectators handle the papers themselves, which make them thoroughly intrigued with the effect.