Have a spectator freely pick a card from a red deck of Bicycle. Once the card is chosen and signed, the card is shuffled back into the deck. Then magician takes out an envelope with blue clips inside, get them out onto the table and ask the spectators to take one of each and hold them in their hand. Then the spectators are asked to follow what the magician does in the next.  Pull the clip from both side,the hard clip gets stretch and looks like soft,then squeeze it with both hands, it changes into a big blue clip. But the spectators fail to do that. Magician says the big clip can help find the spectator's card. He clips one card in the deck, when revealved, it turns out to be selected card. Magically the color of the card is changed to blue from red !
 
You receive all you need to perform the effect, except a regular deck of cards.